Cover [Abstract] Document Information [Table] Legal Entity [Axis] Entity [Domain] San Diego Gas Electric Company [Member] SAN DIEGO GAS & ELECTRIC COMPANY [Member] San diego gas electric company. Class of Stock [Axis] Class of Stock [Domain] Sempra Energy 575 Junior Subordinated Notes Due 2079 25 par value [Member] Sempra Energy 5.75% Junior Subordinated Notes Due 2079, $25 par value [Member] Common Stock [Member] Sempra Energy Common Stock, without par value [Member] Document Information [Line Items] Document Type Amendment Flag Document Period End Date Entity Registrant Name Entity File Number Entity Central Index Key Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Entity Emerging Growth Company Title of 12(b) Security Trading Symbol Security Exchange Name