DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE IMPACT ON INCOME (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative [Line Items]
Pretax gain (loss) reclassified from AOCI into earnings	$ 63	$ (18)	$ 161	$ 89
Pretax (loss) gain on derivatives recognized in earnings	(1)	7	5	(23)
Derivatives designated as hedging instruments | Cash Flow Hedging
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	67	(33)	187	76
Pretax gain (loss) reclassified from AOCI into earnings	(12)	(11)	(17)	(40)
Derivatives designated as hedging instruments | Interest Expense | Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	13	(6)	35	20
Pretax gain (loss) reclassified from AOCI into earnings	0	1	1	(1)
Derivatives designated as hedging instruments | Interest Expense | Cash Flow Hedging | Interest Rate Contract | Southern California Gas Company
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	0	0	0	0
Pretax gain (loss) reclassified from AOCI into earnings	(1)	0	(1)	0
Derivatives designated as hedging instruments | Interest Expense | Cash Flow Hedging | Interest rate and foreign exchange instruments
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	4	7
Pretax gain (loss) reclassified from AOCI into earnings	1	0	1	0
Derivatives designated as hedging instruments | Equity Earnings | Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	50	(32)	144	51
Pretax gain (loss) reclassified from AOCI into earnings	(13)	(19)	(27)	(38)
Derivatives designated as hedging instruments | Equity Earnings | Cash Flow Hedging | Foreign Exchange Instruments
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	0	(1)	(2)	2
Pretax gain (loss) reclassified from AOCI into earnings	0	0	1	(1)
Derivatives designated as hedging instruments | Revenues: Energy- Related Businesses | Cash Flow Hedging | Foreign Exchange Instruments
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	0	(1)	(3)	2
Pretax gain (loss) reclassified from AOCI into earnings	1	0	2	(1)
Derivatives designated as hedging instruments | Other (Expense) Income, Net | Cash Flow Hedging | Foreign Exchange Instruments
Derivative [Line Items]
Pretax gain (loss) reclassified from AOCI into earnings	(1)	0	(1)	0
Derivatives designated as hedging instruments | Other (Expense) Income, Net | Cash Flow Hedging | Interest rate and foreign exchange instruments
Derivative [Line Items]
Pretax gain (loss) recognized in OCI			13	1
Pretax gain (loss) reclassified from AOCI into earnings	0	7	6	1
Derivatives not designated as hedging instruments
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(179)	(101)	(238)	(169)
Derivatives not designated as hedging instruments | Foreign Exchange Instruments
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	0	0	0	(24)
Derivatives not designated as hedging instruments | Commodity contracts not subject to rate recovery
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(151)	(142)	(228)	(190)
Derivatives not designated as hedging instruments | Commodity contracts subject to rate recovery | Southern California Gas Company
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(4)	0	(4)	2
Derivatives not designated as hedging instruments | Commodity contracts subject to rate recovery | San Diego Gas and Electric Company
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(24)	41	(6)	43
Derivatives not designated as hedging instruments | Cost of Electric Fuel and Purchased Power | Commodity contracts subject to rate recovery
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(24)	41	(6)	43
Derivatives not designated as hedging instruments | Cost of Natural Gas | Commodity contracts subject to rate recovery
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	$ (4)	$ 0	$ (4)	$ 2