DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE IMPACT ON INCOME (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative [Line Items]
Pretax gain (loss) reclassified from AOCI into earnings	$ 98	$ 107
Pretax (loss) gain on derivatives recognized in earnings	6	(30)
Derivatives designated as hedging instruments: | Cash Flow Hedging
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	120	109
Pretax gain (loss) reclassified from AOCI into earnings	(5)	(29)
Derivatives designated as hedging instruments: | Interest Expense | Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	22	26
Pretax gain (loss) reclassified from AOCI into earnings	1	(2)
Derivatives designated as hedging instruments: | Equity Earnings | Cash Flow Hedging | Interest Rate Contract
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	94	83
Pretax gain (loss) reclassified from AOCI into earnings	(14)	(19)
Derivatives designated as hedging instruments: | Equity Earnings | Cash Flow Hedging | Foreign Exchange Instruments
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	(2)	3
Pretax gain (loss) reclassified from AOCI into earnings	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	(3)	3
Pretax gain (loss) reclassified from AOCI into earnings	1	(1)
Derivatives designated as hedging instruments: | Other Income, Net | Cash Flow Hedging | Interest rate and foreign exchange instruments
Derivative [Line Items]
Pretax gain (loss) recognized in OCI	9	(6)
Pretax gain (loss) reclassified from AOCI into earnings	6	(6)
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(59)	(68)
Derivatives not designated as hedging instruments: | Revenues: Energy- Related Businesses | Commodity contracts not subject to rate recovery
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	(77)	(48)
Derivatives not designated as hedging instruments: | Other Income, Net | Foreign Exchange Instruments
Derivative [Line Items]
Pretax (loss) gain on derivatives recognized in earnings	0	(24)
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	18	2
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	0	2
San Diego Gas and Electric Company | 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	18	2
Southern California Gas Company | 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	$ 0	$ 2