DERIVATIVE FINANCIAL INSTRUMENTS - DERIVATIVE IMPACT ON INCOME (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative [Line Items]
Pretax gain (loss) reclassified from AOCI into earnings	$ (95)	$ 98
Pretax gain (loss) on derivatives recognized in earnings	$ 5	$ 6
Natural gas
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Goods and Services Sold	Cost of Goods and Services Sold
Electric fuel and purchased power
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Goods and Services Sold	Cost of Goods and Services Sold
Commodity contracts not subject to rate recovery
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Unregulated Operating Revenue	Unregulated Operating Revenue
Contingent Interest Rate Derivative
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	INTEREST EXPENSE	INTEREST EXPENSE
Derivatives designated as hedging instruments | Cash Flow Hedging
Derivative [Line Items]
Pretax (loss) gain recognized in OCI	$ (98)	$ 120
Pretax gain (loss) reclassified from AOCI into earnings	11	(5)
Derivatives designated as hedging instruments | Interest Expense | Cash Flow Hedging | Interest rate instruments
Derivative [Line Items]
Pretax (loss) gain recognized in OCI	(77)	22
Pretax gain (loss) reclassified from AOCI into earnings	0	1
Derivatives designated as hedging instruments | Equity Earnings | Cash Flow Hedging | Interest rate instruments
Derivative [Line Items]
Pretax (loss) gain recognized in OCI	(17)	94
Pretax gain (loss) reclassified from AOCI into earnings	7	(14)
Derivatives designated as hedging instruments | Equity Earnings | Cash Flow Hedging | Foreign Exchange Instruments
Derivative [Line Items]
Pretax (loss) gain recognized in OCI	(5)	(2)
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 (loss) gain recognized in OCI	(6)	(3)
Pretax gain (loss) reclassified from AOCI into earnings	0	1
Derivatives designated as hedging instruments | Other Income, Net | Cash Flow Hedging | Foreign Exchange Instruments
Derivative [Line Items]
Pretax gain (loss) reclassified from AOCI into earnings	(1)	0
Derivatives designated as hedging instruments | Other Income, Net | Cash Flow Hedging | Interest rate and foreign exchange instruments
Derivative [Line Items]
Pretax (loss) gain recognized in OCI	7	9
Pretax gain (loss) reclassified from AOCI into earnings	6	6
Derivatives not designated as hedging instruments
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	384	(59)
Derivatives not designated as hedging instruments | Commodity contracts not subject to rate recovery
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	449	(77)
Derivatives not designated as hedging instruments | Commodity contracts subject to rate recovery | Southern California Gas Company
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	(27)	0
Derivatives not designated as hedging instruments | Commodity contracts subject to rate recovery | San Diego Gas and Electric Company
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	9	18
Derivatives not designated as hedging instruments | Contingent Interest Rate Derivative
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	(47)	0
Derivatives not designated as hedging instruments | Cost of Electric Fuel and Purchased Power | Commodity contracts subject to rate recovery
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	9	18
Derivatives not designated as hedging instruments | Cost of Natural Gas | Commodity contracts subject to rate recovery
Derivative [Line Items]
Pretax gain (loss) on derivatives recognized in earnings	$ (27)	$ 0