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Document and Entity Information
Apr. 12, 2021
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001032208
Document Type 8-K
Document Period End Date Apr. 12, 2021
Entity Registrant Name SEMPRA ENERGY
Entity Incorporation State Country Code CA
Entity File Number 1-14201
Entity Tax Identification Number 33-0732627
Entity Address, Address Line One 488 8th Avenue
Entity Address, City or Town San Diego
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92101
City Area Code (619)
Local Phone Number 696-2000
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Sempra Energy Common Stock, without par value
Trading Symbol SRE
Security Exchange Name NYSE
Convertible Preferred Stock Series B [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Sempra Energy 6.75% Mandatory Convertible Preferred Stock, Series B, $100 liquidation preference
Trading Symbol SREPRB
Security Exchange Name NYSE
Sempra Energy 575 Junior Subordinated Notes Due 2079 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Sempra Energy 5.75% Junior Subordinated Notes Due 2079, $25 par value
Trading Symbol SREA
Security Exchange Name NYSE