DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE INSTRUMENTS ON THE CONDENSED BALANCE SHEET (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Other current assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	$ 36	$ 74
Additional cash collateral for commodity contracts not subject to rate recovery	41	58
Additional cash collateral for commodity contracts subject to rate recovery	37	46
Total	114	178
Other long-term assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	68	62
Additional cash collateral for commodity contracts not subject to rate recovery	0	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	68	62
Other Current Liabilities
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(152)	(87)
Additional cash collateral for commodity contracts not subject to rate recovery	0	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(152)	(87)
Deferred credits and other
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(6)	(134)
Additional cash collateral for commodity contracts not subject to rate recovery	0	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(6)	(134)
Derivatives designated as hedging instruments: | Other current assets
Derivatives designated as hedging instruments:
Interest rate instruments	0	0
Foreign exchange instruments	0	1
Interest rate and foreign exchange instruments	0	0
Derivatives designated as hedging instruments: | Other long-term assets
Derivatives designated as hedging instruments:
Interest rate instruments	21	6
Foreign exchange instruments	0	1
Interest rate and foreign exchange instruments	0	0
Derivatives designated as hedging instruments: | Other Current Liabilities
Derivatives designated as hedging instruments:
Interest rate instruments	(1)	(6)
Foreign exchange instruments	(2)	(1)
Interest rate and foreign exchange instruments	(121)	(1)
Derivatives designated as hedging instruments: | Deferred credits and other
Derivatives designated as hedging instruments:
Interest rate instruments	0	(2)
Foreign exchange instruments	0	0
Interest rate and foreign exchange instruments	0	(130)
Derivatives not designated as hedging instruments: | Other current assets
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	174	136
Associated offsetting commodity contracts	(169)	(93)
Commodity contracts subject to rate recovery	39	38
Associated offsetting commodity contracts	(8)	(8)
Derivatives not designated as hedging instruments: | Other long-term assets
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	38	11
Associated offsetting commodity contracts	(36)	(8)
Commodity contracts subject to rate recovery	45	52
Associated offsetting commodity contracts	0	0
Derivatives not designated as hedging instruments: | Other Current Liabilities
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	(186)	(122)
Associated offsetting commodity contracts	169	93
Commodity contracts subject to rate recovery	(19)	(58)
Associated offsetting commodity contracts	8	8
Derivatives not designated as hedging instruments: | Deferred credits and other
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	(42)	(10)
Associated offsetting commodity contracts	36	8
Commodity contracts subject to rate recovery	0	0
Associated offsetting commodity contracts	0	0
San Diego Gas and Electric Company | Other current assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	31	29
Additional cash collateral for commodity contracts subject to rate recovery	35	28
Total	66	57
San Diego Gas and Electric Company | Other long-term assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	45	52
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	45	52
San Diego Gas and Electric Company | Other Current Liabilities
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(3)	(15)
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(3)	(15)
San Diego Gas and Electric Company | Deferred credits and other
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	0	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	0	0
San Diego Gas and Electric Company | Derivatives not designated as hedging instruments: | Other current assets
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	39	34
Associated offsetting commodity contracts	(8)	(5)
San Diego Gas and Electric Company | Derivatives not designated as hedging instruments: | Other long-term assets
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	45	52
Associated offsetting commodity contracts	0	0
San Diego Gas and Electric Company | Derivatives not designated as hedging instruments: | Other Current Liabilities
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	(11)	(20)
Associated offsetting commodity contracts	8	5
San Diego Gas and Electric Company | Derivatives not designated as hedging instruments: | Deferred credits and other
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	0	0
Associated offsetting commodity contracts	0	0
Southern California Gas Company | Other current assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	0	1
Additional cash collateral for commodity contracts subject to rate recovery	2	18
Total	2	19
Southern California Gas Company | Other long-term assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	0	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	0	0
Southern California Gas Company | Other Current Liabilities
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(8)	(35)
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(8)	(35)
Southern California Gas Company | Deferred credits and other
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	0	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	0	0
Southern California Gas Company | Derivatives not designated as hedging instruments: | Other current assets
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	0	4
Associated offsetting commodity contracts		(3)
Southern California Gas Company | Derivatives not designated as hedging instruments: | Other long-term assets
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	0	0
Associated offsetting commodity contracts		0
Southern California Gas Company | Derivatives not designated as hedging instruments: | Other Current Liabilities
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	(8)	(38)
Associated offsetting commodity contracts		3
Southern California Gas Company | Derivatives not designated as hedging instruments: | Deferred credits and other
Derivatives not designated as hedging instruments:
Commodity contracts subject to rate recovery	$ 0	0
Associated offsetting commodity contracts		$ 0