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ACQUISTIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - Divestitures (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 22, 2019
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 07, 2019
Jan. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain (loss) on sale of assets     $ 36 $ (3) $ 63    
Sempra Infrastructure | Mississippi Hub And Bay Gas | Disposal Group Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale           $ 322  
Sempra Infrastructure | Other Non-Utility assets | Disposal Group Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale             $ 5
Sempra Renewables | Wind Generation Projects | Disposal Group Held-for-sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale $ 569            
Gain (loss) on sale of assets 61            
Gain on sale of assets, after tax and NCI $ 45            
Parent and Other | PXISE Energy Solutions LLC              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale   $ 38 $ 38        
Transaction costs   4          
Gain on sale   36          
Gain on sale of assets, net of tax   $ 26