DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE INSTRUMENTS ON THE CONDENSED BALANCE SHEET (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other current assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	$ 30	$ 333
Additional cash collateral for commodity contracts not subject to rate recovery	89	451
Additional cash collateral for commodity contracts subject to rate recovery	82	18
Total	201	802
Other long-term assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	379	152
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	379	152
Other current liabilities
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(169)	(280)
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	(169)	(280)
Deferred credits and other
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(9)	(94)
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	(9)	(94)
Derivatives designated as hedging instruments: | Other current assets
Derivatives designated as hedging instruments:
Interest rate instruments	15	10
Foreign exchange instruments	0	0
Interest rate and foreign exchange instruments		0
Derivatives designated as hedging instruments: | Other long-term assets
Derivatives designated as hedging instruments:
Interest rate instruments	363	33
Foreign exchange instruments	1	0
Interest rate and foreign exchange instruments		0
Derivatives designated as hedging instruments: | Other current liabilities
Derivatives designated as hedging instruments:
Interest rate instruments	0	0
Foreign exchange instruments	(8)	(7)
Interest rate and foreign exchange instruments		(105)
Derivatives designated as hedging instruments: | Deferred credits and other
Derivatives designated as hedging instruments:
Interest rate instruments	0	0
Foreign exchange instruments	0	(1)
Interest rate and foreign exchange instruments		0
Derivatives not designated as hedging instruments: | Other current assets
Derivatives designated as hedging instruments:
Interest rate instruments		33
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	175	480
Associated offsetting commodity contracts	(166)	(301)
Commodity contracts subject to rate recovery	22	138
Associated offsetting commodity contracts	(16)	(27)
Associated offsetting cash collateral	0
Derivatives not designated as hedging instruments: | Other long-term assets
Derivatives designated as hedging instruments:
Interest rate instruments		0
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	25	133
Associated offsetting commodity contracts	(22)	(39)
Commodity contracts subject to rate recovery	15	27
Associated offsetting commodity contracts	(3)	(2)
Associated offsetting cash collateral	0
Derivatives not designated as hedging instruments: | Other current liabilities
Derivatives designated as hedging instruments:
Interest rate instruments		0
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	(172)	(399)
Associated offsetting commodity contracts	166	301
Commodity contracts subject to rate recovery	(171)	(97)
Associated offsetting commodity contracts	16	27
Associated offsetting cash collateral	0
Derivatives not designated as hedging instruments: | Deferred credits and other
Derivatives designated as hedging instruments:
Interest rate instruments		0
Derivatives not designated as hedging instruments:
Commodity contracts not subject to rate recovery	(29)	(132)
Associated offsetting commodity contracts	22	39
Commodity contracts subject to rate recovery	(6)	(2)
Associated offsetting commodity contracts	3	2
Associated offsetting cash collateral	1
San Diego Gas and Electric Company | Other current assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	6	95
Additional cash collateral for commodity contracts subject to rate recovery	80	17
Total	86	112
San Diego Gas and Electric Company | Other long-term assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	12	25
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	12	25
San Diego Gas and Electric Company | Other current liabilities
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(1)	(1)
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(1)	(1)
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	18	107
Associated offsetting commodity contracts	(12)	(12)
Associated offsetting cash collateral	0
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	15	27
Associated offsetting commodity contracts	(3)	(2)
Associated offsetting cash collateral	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	(13)	(13)
Associated offsetting commodity contracts	12	12
Associated offsetting cash collateral	0
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	(4)	(2)
Associated offsetting commodity contracts	3	2
Associated offsetting cash collateral	1
Southern California Gas Company | Other current assets
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	0	16
Additional cash collateral for commodity contracts subject to rate recovery	2	1
Total	2	17
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	(154)	(69)
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(154)	(69)
Southern California Gas Company | Deferred credits and other
Derivatives not designated as hedging instruments:
Net amounts presented on the balance sheet	(2)	0
Additional cash collateral for commodity contracts subject to rate recovery	0	0
Total	(2)	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	4	31
Associated offsetting commodity contracts	(4)	(15)
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	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	(158)	(84)
Associated offsetting commodity contracts	4	15
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	(2)	0
Associated offsetting commodity contracts	$ 0	$ 0