DERIVATIVE FINANCIAL INSTRUMENTS - BALANCE SHEET (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other current assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	$ 74,000,000	$ 57,000,000
Additional margin posted for commodity contracts not subject to rate recovery	58,000,000	21,000,000
Additional margin posted for commodity contracts subject to rate recovery	46,000,000	30,000,000
Total	178,000,000	108,000,000
Other long-term assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	62,000,000	100,000,000
Additional margin posted for commodity contracts not subject to rate recovery	0	0
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	62,000,000	100,000,000
Other current liabilities
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	(87,000,000)	(72,000,000)
Additional margin posted for commodity contracts not subject to rate recovery	0	0
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	(87,000,000)	(72,000,000)
Deferred credits and other
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	(134,000,000)	(188,000,000)
Additional margin posted for commodity contracts not subject to rate recovery	0	0
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	(134,000,000)	(188,000,000)
Derivatives designated as hedging instruments: | Other current assets
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate instruments	0	0	$ 0
Foreign exchange instruments	1,000,000	0	0
Interest rate and foreign exchange instruments	0	0	0
Derivatives designated as hedging instruments: | Other long-term assets
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate instruments	6,000,000	1,000,000	3,000,000
Foreign exchange instruments	1,000,000	0	0
Interest rate and foreign exchange instruments	0	0	0
Derivatives designated as hedging instruments: | Other current liabilities
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate instruments	(6,000,000)	(16,000,000)	(11,000,000)
Foreign exchange instruments	(1,000,000)	(9,000,000)	(6,000,000)
Interest rate and foreign exchange instruments	(1,000,000)	(1,000,000)	0
Derivatives designated as hedging instruments: | Deferred credits and other
Derivative Instruments in Hedges, at Fair Value, Net [Abstract]
Interest rate instruments	(2,000,000)	(31,000,000)	(17,000,000)
Foreign exchange instruments	0	(2,000,000)	(1,000,000)
Interest rate and foreign exchange instruments	(130,000,000)	(127,000,000)	(122,000,000)
Derivatives not designated as hedging instruments: | Other current assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Foreign exchange instruments		24,000,000	41,000,000
Associated offsetting foreign exchange instruments			(20,000,000)
Commodity contracts not subject to rate recovery	136,000,000	82,000,000	34,000,000
Associated offsetting commodity contracts not subject to rate recovery	(93,000,000)	(82,000,000)	(32,000,000)
Commodity contracts subject to rate recovery	38,000,000	35,000,000	41,000,000
Associated offsetting commodity contracts subject to rate recovery	(8,000,000)	(2,000,000)	(6,000,000)
Associated cash collateral commodity contracts subject to rate recovery			0
Net amount presented on balance sheet			58,000,000
Additional margin posted for commodity contracts not subject to rate recovery			43,000,000
Additional margin posted for commodity contracts subject to rate recovery			25,000,000
Total			126,000,000
Derivatives not designated as hedging instruments: | Other long-term assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Foreign exchange instruments		0	0
Associated offsetting foreign exchange instruments			0
Commodity contracts not subject to rate recovery	11,000,000	17,000,000	11,000,000
Associated offsetting commodity contracts not subject to rate recovery	(8,000,000)	(13,000,000)	(2,000,000)
Commodity contracts subject to rate recovery	52,000,000	95,000,000	76,000,000
Associated offsetting commodity contracts subject to rate recovery	0	0	(3,000,000)
Associated cash collateral commodity contracts subject to rate recovery			0
Net amount presented on balance sheet			85,000,000
Additional margin posted for commodity contracts not subject to rate recovery			0
Additional margin posted for commodity contracts subject to rate recovery			0
Total			85,000,000
Derivatives not designated as hedging instruments: | Other current liabilities
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Foreign exchange instruments		0	(20,000,000)
Associated offsetting foreign exchange instruments			20,000,000
Commodity contracts not subject to rate recovery	(122,000,000)	(95,000,000)	(41,000,000)
Associated offsetting commodity contracts not subject to rate recovery	93,000,000	82,000,000	32,000,000
Commodity contracts subject to rate recovery	(58,000,000)	(35,000,000)	(47,000,000)
Associated offsetting commodity contracts subject to rate recovery	8,000,000	2,000,000	6,000,000
Associated cash collateral commodity contracts subject to rate recovery			14,000,000
Net amount presented on balance sheet			(53,000,000)
Additional margin posted for commodity contracts not subject to rate recovery			0
Additional margin posted for commodity contracts subject to rate recovery			0
Total			(53,000,000)
Derivatives not designated as hedging instruments: | Deferred credits and other
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Foreign exchange instruments		0	0
Associated offsetting foreign exchange instruments			0
Commodity contracts not subject to rate recovery	(10,000,000)	(16,000,000)	(10,000,000)
Associated offsetting commodity contracts not subject to rate recovery	8,000,000	13,000,000	2,000,000
Commodity contracts subject to rate recovery	0	(25,000,000)	(47,000,000)
Associated offsetting commodity contracts subject to rate recovery	0	0	3,000,000
Associated cash collateral commodity contracts subject to rate recovery			0
Net amount presented on balance sheet			(192,000,000)
Additional margin posted for commodity contracts not subject to rate recovery			0
Additional margin posted for commodity contracts subject to rate recovery			0
Total			(192,000,000)
San Diego Gas and Electric Company [Member] | Other current assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	29,000,000	31,000,000
Additional margin posted for commodity contracts subject to rate recovery	28,000,000	24,000,000
Total	57,000,000	55,000,000
San Diego Gas and Electric Company [Member] | Other long-term assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	52,000,000	95,000,000
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	52,000,000	95,000,000
San Diego Gas and Electric Company [Member] | Other current liabilities
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	(15,000,000)	(27,000,000)
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	(15,000,000)	(27,000,000)
San Diego Gas and Electric Company [Member] | Deferred credits and other
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	0	(25,000,000)
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	0	(25,000,000)
San Diego Gas and Electric Company [Member] | Derivatives not designated as hedging instruments: | Other current assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	34,000,000	32,000,000	30,000,000
Associated offsetting commodity contracts subject to rate recovery	(5,000,000)	(1,000,000)	(4,000,000)
Associated cash collateral commodity contracts subject to rate recovery			0
Net amount presented on balance sheet			26,000,000
Additional margin posted for commodity contracts subject to rate recovery			16,000,000
Total			42,000,000
San Diego Gas and Electric Company [Member] | Derivatives not designated as hedging instruments: | Other long-term assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	52,000,000	95,000,000	76,000,000
Associated offsetting commodity contracts subject to rate recovery	0	0	(3,000,000)
Associated cash collateral commodity contracts subject to rate recovery			0
Net amount presented on balance sheet			73,000,000
Additional margin posted for commodity contracts subject to rate recovery			0
Total			73,000,000
San Diego Gas and Electric Company [Member] | Derivatives not designated as hedging instruments: | Other current liabilities
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	(20,000,000)	(28,000,000)	(41,000,000)
Associated offsetting commodity contracts subject to rate recovery	5,000,000	1,000,000	4,000,000
Associated cash collateral commodity contracts subject to rate recovery			14,000,000
Net amount presented on balance sheet			(23,000,000)
Additional margin posted for commodity contracts subject to rate recovery			0
Total			(23,000,000)
San Diego Gas and Electric Company [Member] | Derivatives not designated as hedging instruments: | Deferred credits and other
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	0	(25,000,000)	(47,000,000)
Associated offsetting commodity contracts subject to rate recovery	0	0	3,000,000
Associated cash collateral commodity contracts subject to rate recovery			0
Net amount presented on balance sheet			(44,000,000)
Additional margin posted for commodity contracts subject to rate recovery			0
Total			(44,000,000)
SoCalGas | Other current assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	1,000,000	2,000,000
Additional margin posted for commodity contracts subject to rate recovery	18,000,000	6,000,000
Total	19,000,000	8,000,000
SoCalGas | Other long-term assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	0	0
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	0	0
SoCalGas | Other current liabilities
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	(35,000,000)	(6,000,000)
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	(35,000,000)	(6,000,000)
SoCalGas | Deferred credits and other
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Net amount presented on balance sheet	0	0
Additional margin posted for commodity contracts subject to rate recovery	0	0
Total	0	0
SoCalGas | Derivatives not designated as hedging instruments: | Other current assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	4,000,000	3,000,000	11,000,000
Associated offsetting commodity contracts subject to rate recovery	(3,000,000)	(1,000,000)	(2,000,000)
Net amount presented on balance sheet			9,000,000
Additional margin posted for commodity contracts subject to rate recovery			9,000,000
Total			18,000,000
SoCalGas | Derivatives not designated as hedging instruments: | Other long-term assets
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	0	0	0
Associated offsetting commodity contracts subject to rate recovery	0	0	0
Net amount presented on balance sheet			0
Additional margin posted for commodity contracts subject to rate recovery			0
Total			0
SoCalGas | Derivatives not designated as hedging instruments: | Other current liabilities
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	(38,000,000)	(7,000,000)	(6,000,000)
Associated offsetting commodity contracts subject to rate recovery	3,000,000	1,000,000	2,000,000
Net amount presented on balance sheet			(4,000,000)
Additional margin posted for commodity contracts subject to rate recovery			0
Total			(4,000,000)
SoCalGas | Derivatives not designated as hedging instruments: | Deferred credits and other
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net [Abstract]
Commodity contracts subject to rate recovery	0	0	0
Associated offsetting commodity contracts subject to rate recovery	$ 0	$ 0	0
Net amount presented on balance sheet			0
Additional margin posted for commodity contracts subject to rate recovery			0
Total			$ 0