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decommissioning trusts - Other securities Financial Instruments, Owned, Other, at Fair Value New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Other Commitments [Axis] Other Commitments [Axis] Sempra South American Utilities [Member] Sempra South American Utilities [Member] Number of lawsuits filed Loss Contingency, New Claims Filed, Number Capital Structure [Domain] Capital Structure [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Reduction in carrying value Sales-type Lease, Initial Direct Cost Expense, Commencement Subsequent Event [Member] Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Income before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Net intangible assets Finite-Lived Intangible Assets, Net Goodwill Goodwill Nuclear decommissioning trusts - Municipal bonds Financial Instruments, Owned, State and Municipal Government Obligations, at Fair Value Gains (Losses) on Cash Flow hedges Attributable to Noncontrolling Interests [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] Gas market [Member] Natural Gas, Gathering, Transportation, Marketing and Processing [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Luz Del Sur [Member] Luz Del Sur [Member] Luz Del Sur [Member] Scenario [Domain] Scenario [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Derivative Instruments on the Condensed Consolidated Balance Sheets Table Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table 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Additional FERC revenues FERC, Revenue Requirement FERC, Revenue Requirement Derecognized PP&E for net investment in sales-type lease Decrease in Property Plant and Equipment For Net Investment in Sales-Type Lease Decrease in Property Plant and Equipment For Net Investment in Sales-Type Lease Related Party [Axis] Related Party [Axis] Beginning balance Ending balance Allowance for credit losses Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Unamortized discount and debt issuance costs Unamortized Discount and Debt Issuance Costs Unamortized Discount and Debt Issuance Costs Commodity Contracts Subject To Rate Recovery [Member] Commodity contracts subject to rate recovery [Member] Commodity Contracts Subject To Rate Recovery [Member] Secured Debt Secured Debt [Member] Inventory, Current [Table] Inventory, Current [Table] Income tax benefit (expense) Discontinued Operation, Tax Effect of Discontinued Operation Additional ownership percentage Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage O&M agreement [Member] Operation and Maintenance Agreement [Member] Operation and Maintenance Agreement [Member] Commodity contracts not subject to rate recovery [Member] Commodity Contracts Not Subject To Rate Recovery [Member] Other Long Term Debt, Due July 2030 Other Long Term Debt, Due July 2030 [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Deconsolidation Noncontrolling Interest, Decrease from Deconsolidation Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Entity Interactive Data Current Entity Interactive Data Current Reserve for Aliso Canyon costs Reserve for Aliso Canyon Costs Reserve for Aliso Canyon Costs Available unused credit Line of Credit Facility, Remaining Borrowing Capacity Number of lawsuits Loss Contingency, Pending Claims, Number Pension and other postretirement benefits Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax U.S. government corporations and agencies [Member] US Treasury and Government [Member] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Preferred dividends of subsidiary Preferred Dividends Paid by Subsidiaries The cash outflow for preferred dividends paid by subsidiaries. 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Fine related to Energy Efficiency Program inquiry Legal Fines Related To EEP Inquiry Legal Fines Related To EEP Inquiry Capitalized Financing Costs Table Schedule of Capitalization [Table Text Block] Regulatory assets Regulatory Assets, Current Schedule of Capitalization [Table] Schedule of Capitalization [Table] Long-term amounts due from unconsolidated affiliates, allowance for credit losses Investments In And Advances To Affiliates, Allowance For Credit Loss Investments In And Advances To Affiliates, Allowance For Credit Loss Other Income, Nonoperating [Abstract] Other Income, Nonoperating [Abstract] Provisions for expected credit losses Accounts Receivable, Credit Loss Expense (Reversal) Sempra Mexico [Member] Sempra Mexico Segment [Member] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] (Losses) earnings from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Total Assets Measured at Fair Value Assets, Fair Value Disclosure Document Transition Report Document Transition Report Interest rate on due from affiliate, noncurrent Related Party Transaction, Rate Sunrise Powerlink fire mitigation [Member] Sunrise Powerlink Fire Mitigation [Member] Total liabilities and equity Liabilities and Equity Accrued franchise fees Other Accrued Liabilities, Current Accelerated share repurchase program, prepaid amount Accelerated Share Repurchase Program, Adjustment Financial instruments Pretax gain (loss) reclassified from AOCI into earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Customer deposits Contract with Customer, Liability, Current Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Due from affiliates, allowance for credit loss Due From Related Party, Noncurrent, Allowance For Credit Loss Due From Related Party, Noncurrent, Allowance For Credit Loss Other noncontrolling interests Other Noncontrolling Interests Derivative [Line Items] Derivative [Line Items] Property, plant and equipment: Property, Plant and Equipment, Net [Abstract] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Depreciation expense Depreciation, Lessor Asset under Operating Lease Promissory Note for SDSRA Distribution [Member] Promissory Note for SDSRA Distribution [Member] Promissory Note for SDSRA Distribution Operating expenses Operating Expenses [Abstract] Common stock repurchased, average price (in dollars per share) Treasury Stock Acquired, Average Cost Per Share Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Maximum secondary financial protection Secondary Financial Protection, Maximum Segment Reporting Information, Profit (Loss) [Abstract] Segment Reporting Information, Profit (Loss) [Abstract] Other Commitment, to be Paid, Year Five Other Commitment, to be Paid, Year Five Minimum [Member] Minimum [Member] Advances from unconsolidated affiliates Proceeds from Contributions from Affiliates Common stock exchange ratio Business Combination, Shares Acquired, Conversion Ratio Business Combination, Shares Acquired, Conversion Ratio Amount outstanding Long-term Line of Credit Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Oncor Electric Delivery Company LLC. [Member] Oncor Electric Delivery Company LLC. [Member] Oncor Electric Delivery Company LLC. [Member] Total Liabilities Measured at Fair Value Financial and Nonfinancial Liabilities, Fair Value Disclosure (Loss) income from continuing operations before income taxes and equity earnings (Loss) income from continuing operations before income taxes and equity earnings Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized IEnova [Member] Ownership Interests Held By Others IEnova [Member] Proceeds from sale of assets Proceeds from Sale of Productive Assets Operating expenses Utilities Operating Expense [Abstract] Employee benefit costs [Member] Employee Benefit Costs [Member] Convertible Preferred Stock Series B [Member] Convertible Preferred Stock Series B [Member] Convertible Preferred Stock Series B [Member] Maximum nuclear liability loss coverage per incident Secondary Financial Protection, Company Contribution, Annual Maximum Term of interest rate cash flow hedge Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Acquired percentage interest Business Acquisition, Percentage of Voting Interests Acquired Issuances of stock Stock Issued During Period, Value, New Issues Restricted cash Restricted cash, noncurrent Restricted Cash and Cash Equivalents, Noncurrent Maximum nuclear liability insurance coverage Nuclear Liability Insurance Coverage, Maximum Commodity contracts not subject to rate recovery Derivative Commodity Contracts Not Subject To Rate Recovery Nondesignated Derivative commodity contracts not subject to rate recovery, nondesignated. 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[Member] Energy Future Holdings Corp. [Member] Energy Future Holdings Corp. 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discontinued operations attributable to Sempra (Losses) earnings from discontinued operations attributable to Sempra Discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Insurance settlements receivable Insurance Settlements Receivable Purchases of nuclear decommissioning trust assets Payments to Acquire Investments to be Held in Decommissioning Trust Fund Green First Mortgage Bonds Due 2051 Green First Mortgage Bonds Due 2051 [Member] Green First Mortgage Bonds Due 2051 Change in 2023 Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Year Three Increase (Decrease) in Unrecorded Unconditional Purchase Obligation, Year Three Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total other comprehensive (loss) income Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Recurring [Member] Fair Value, Recurring [Member] 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Company LLC [Member] Oncor Electric Delivery Holdings Company LLC [Member] Future amortization expense, per year, next four years Finite Lived Intangible Assets, Future Amortization Expense Per Year, Next Four Years Finite Lived Intangible Assets, Future Amortization Expense Per Year, Next Four Years Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Liberty Gas Storage, LLC [Member] Liberty Gas Storage, LLC [Member] Liberty Gas Storage, LLC [Member] Reserve for Aliso Canyon costs Payable Related to Natural Gas Leak, Current Payable Related to Natural Gas Leak, Current FERC requirement to maintain common equity ratio, at or above (percent) FERC Requirement To Maintain Common Equity Ratio At Or Above FERC Requirement To Maintain Common Equity Ratio At Or Above Direct and indirect net debt at closing Noncontrolling Interest, Direct And Indirect Net Debt At Closing Noncontrolling Interest, Direct And Indirect Net Debt At Closing Class of Stock [Domain] Class of Stock [Domain] Preferred dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Materials and supplies Energy Related Inventory, Materials And Supplies Energy related inventory, materials and supplies. Greenhouse gas allowances Greenhouse Gas Allowances, Current Greenhouse Gas Allowances, Current Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Interest rate and foreign exchange instruments Derivative Interest Rate And Foreign Exchange Instruments Designated Interest rate instruments designated as hedging instruments. Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership [Domain] Ownership [Domain] Position [Domain] Position [Domain] Net regulatory assets (liabilities) Net Regulatory Assets (Liabilities) Net regulatory assets (liabilities). Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Document Information [Line Items] Document Information [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Other current assets Other Assets, Current Percent of dismantlement work expense (as a percent) Environmental Exit Costs, Anticipated Cost, Percentage Environmental Exit Costs, Anticipated Cost, Percentage Maximum nuclear property insurance terrorism coverage Nuclear Property Insurance Terrorism Coverage, Maximum Other Commitment, to be Paid, Year Three Other Commitment, to be Paid, Year Three Net Regulatory Assets (Liabilities) SoCalGas [Member] Net Regulatory Assets (Liabilities) So Cal Gas [Member] Sempra LNG [Member] Sempra LNG [Member] Sempra LNG [Member] Due from Unconsolidated Affiliates - Current Due from Unconsolidated Affiliates - Current [Member] Due from Unconsolidated Affiliates - Current Deferred income taxes (refundable) recoverable in rates [Member] Deferred Income Tax Charge [Member] Noncontrolling Interest, Remaining Shares Of Noncontrolling Interest Noncontrolling Interest, Remaining Shares Of Noncontrolling Interest Noncontrolling Interest, Remaining Shares Of Noncontrolling Interest Derivative liabilities Derivative Liability, Fair Value, Gross Liability SONGS 2 and 3 Decommissioning [Member] SONGS 2 and 3 Decommissioning [Member] SONGS 2 and 3 Decommissioning [Member] Cash, cash equivalents and restricted cash, including discontinued operations, January 1 Cash, cash equivalents and restricted cash, including discontinued operations, September 30 Total cash, cash equivalents and restricted cash on the Condensed Consolidated Statements of Cash Flows Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cost of Electric Fuel and Purchased Power [Member] Cost of Electric Fuel and Purchased Power [Member] Preferred stock [Member] Preferred Stock [Member] Utilities operating revenue Operating revenues Regulated Operating Revenue Cameron LNG [Member] Cameron LNG [Member] Condensed Financial Statements Condensed Financial Statements [Table Text Block] Schedule of Fair Value Inputs Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] (Loss) income from continuing operations, net of income tax (Loss) income from continuing operations, net of income tax Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Write off of unamortized debt issuance costs Write off of Deferred Debt Issuance Cost Insurance Receivable [Member] Insurance Receivable [Member] Insurance Receivable Pension benefits [Member] Pension Plan [Member] Regulated Operations [Abstract] Regulated Operations [Abstract] Accounts Receivable, Allowance for Credit Loss Table Accounts Receivable, Allowance for Credit Loss [Table Text Block] Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant Interests [Line Items] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Foreign Uncommitted Revolving Credit Facility Due October 2023 Foreign Uncommitted Revolving Credit Facility Due October 2023 [Member] Foreign Uncommitted Revolving Credit Facility Due October 2023 [Member] Accounting Standards Update 2016-13 [Member]