DERIVATIVE FINANCIAL INSTRUMENTS - INCOME STATEMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivatives designated as hedging instruments: | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	$ 115	$ (232)	$ (187)
Pretax (loss) gain reclassified from AOCI into earnings	(92)	(67)	(11)
Derivatives designated as hedging instruments: | Cash flow hedges | Gain (Loss) on Sale of Assets | Interest rate instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	0	0	0
Pretax (loss) gain reclassified from AOCI into earnings	0	0	(10)
Derivatives designated as hedging instruments: | Cash flow hedges | Interest Expense | Interest rate instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	29	(34)	(24)
Pretax (loss) gain reclassified from AOCI into earnings	(11)	(10)	(3)
Derivatives designated as hedging instruments: | Cash flow hedges | Interest Expense | Interest rate and foreign exchange instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	(4)	(6)	19
Pretax (loss) gain reclassified from AOCI into earnings	(1)	(1)	0
Derivatives designated as hedging instruments: | Cash flow hedges | Equity Earnings | Interest rate instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	71	(185)	(164)
Pretax (loss) gain reclassified from AOCI into earnings	(73)	(46)	(3)
Derivatives designated as hedging instruments: | Cash flow hedges | Equity Earnings | Foreign exchange instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	8	(3)	(10)
Pretax (loss) gain reclassified from AOCI into earnings	0	0	(2)
Derivatives designated as hedging instruments: | Cash flow hedges | Revenues: Energy- Related Businesses | Foreign exchange instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	11	(4)	(8)
Pretax (loss) gain reclassified from AOCI into earnings	(1)	1	(2)
Derivatives designated as hedging instruments: | Cash flow hedges | Other Income (Expense), Net | Interest rate and foreign exchange instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax (loss) gain reclassified from AOCI into earnings	(6)	(11)	9
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	(219)	42	(100)
Derivatives not designated as hedging instruments: | Revenues: Energy- Related Businesses | Commodity contracts not subject to rate recovery
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	(203)	17	12
Derivatives not designated as hedging instruments: | Other Income (Expense), Net | Foreign exchange instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	(22)	(56)	25
Derivatives not designated as hedging instruments: | Cost of Natural Gas | Commodity contracts subject to rate recovery
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	(25)	(7)	3
Derivatives not designated as hedging instruments: | Cost of Electric Fuel and Purchased Power | Commodity contracts subject to rate recovery
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	31	88	(140)
San Diego Gas and Electric Company [Member] | Derivatives designated as hedging instruments: | Cash flow hedges | Interest Expense | Interest rate instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	0	0	(1)
Pretax (loss) gain reclassified from AOCI into earnings	0	0	(3)
San Diego Gas and Electric Company [Member] | Derivatives not designated as hedging instruments: | Cost of Electric Fuel and Purchased Power | Commodity contracts subject to rate recovery
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	31	88	(140)
SoCalGas | Derivatives designated as hedging instruments: | Cash flow hedges | Interest Expense | Interest rate instruments
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) recognized in OCI	0	0	0
Pretax (loss) gain reclassified from AOCI into earnings	0	0	(1)
SoCalGas | Derivatives not designated as hedging instruments: | Cost of Natural Gas | Commodity contracts subject to rate recovery
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in earnings	$ (25)	$ (7)	$ 3