COMMITMENTS AND CONTINGENCIES - LESSEE MATURITY ANALYSIS OF LIABILITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating leases
2020	$ 75
2021	75
2022	63
2023	54
2024	50
Thereafter	452
Total undiscounted lease payments	769
Less: imputed interest	(272)
Total lease liabilities	497
Less: current lease liabilities	(52)
Long-term lease liabilities	445
Finance leases
2020	198
2021	193
2022	192
2023	192
2024	187
Thereafter	2,629
Total undiscounted lease payments	3,591
Less: imputed interest	(2,302)
Total lease liabilities	1,289
Less: current lease liabilities	(26)
Long-term lease liabilities	1,263
Southern California Gas Company [Member]
Operating leases
2020	22
2021	20
2022	18
2023	13
2024	12
Thereafter	19
Total undiscounted lease payments	104
Less: imputed interest	(11)
Total lease liabilities	93
Less: current lease liabilities	(18)
Long-term lease liabilities	75
Finance leases
2020	6
2021	3
2022	2
2023	2
2024	2
Thereafter	5
Total undiscounted lease payments	20
Less: imputed interest	(1)
Total lease liabilities	19	$ 3
Less: current lease liabilities	(6)
Long-term lease liabilities	13
San Diego Gas and Electric Company [Member]
Operating leases
2020	30
2021	32
2022	22
2023	17
2024	15
Thereafter	28
Total undiscounted lease payments	144
Less: imputed interest	(15)
Total lease liabilities	129
Less: current lease liabilities	(27)
Long-term lease liabilities	102
Finance leases
2020	192
2021	190
2022	190
2023	190
2024	185
Thereafter	2,624
Total undiscounted lease payments	3,571
Less: imputed interest	(2,301)
Total lease liabilities	1,270
Less: current lease liabilities	(20)
Long-term lease liabilities	1,250
Variable lease payments, due in 2020	326
Variable lease payments, due in 2021	328
Variable lease payments, due in 2022	328
Variable lease payments, due in 2023	327
Variable lease payments, due in 2024	328
Variable lease payments, due thereafter	$ 3,707