COMMITMENTS AND CONTINGENCIES - LESSEE MATURITY ANALYSIS OF LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating leases(1)
2022	$ 73
2023	66
2024	62
2025	50
2026	48
Thereafter	493
Total undiscounted lease payments	792
Less: imputed interest	(273)
Total lease liabilities	519	$ 459	$ 497
Less: current lease liabilities	(49)	(52)	(52)
Long-term lease liabilities	470	407	445
Finance leases
2022	209
2023	208
2024	203
2025	199
2026	196
Thereafter	2,292
Total undiscounted lease payments	3,307
Less: imputed interest	(1,972)
Total finance leases	1,335	1,330	1,289
Less: current lease liabilities	(43)	(36)	(26)
Long-term lease liabilities	1,292	1,294	1,263
Purchased-Power Contracts
Operating leases(1)
2022	9
2023	9
2024	9
2025	9
2026	9
Thereafter	87
San Diego Gas and Electric Company [Member]
Operating leases(1)
2022	30
2023	27
2024	25
2025	16
2026	15
Thereafter	105
Total undiscounted lease payments	218
Less: imputed interest	(33)
Total lease liabilities	185	100	129
Less: current lease liabilities	(26)	(27)	(27)
Long-term lease liabilities	159	73	102
Finance leases
2022	197
2023	197
2024	192
2025	188
2026	188
Thereafter	2,279
Total undiscounted lease payments	3,241
Less: imputed interest	(1,967)
Total finance leases	1,274	1,276	1,270
Less: current lease liabilities	(32)	(26)	(20)
Long-term lease liabilities	1,242	1,250	1,250
SoCalGas
Operating leases(1)
2022	17
2023	13
2024	11
2025	10
2026	8
Thereafter	0
Total undiscounted lease payments	59
Less: imputed interest	(3)
Total lease liabilities	56	74	93
Less: current lease liabilities	(15)	(18)	(18)
Long-term lease liabilities	41	56	75
Finance leases
2022	12
2023	11
2024	11
2025	11
2026	8
Thereafter	13
Total undiscounted lease payments	66
Less: imputed interest	(5)
Total finance leases	61	54	19
Less: current lease liabilities	(11)	(10)	(6)
Long-term lease liabilities	$ 50	$ 44	$ 13