COMMITMENTS AND CONTINGENCIES - LESSEE MATURITY OF LEASE LIABILITIES (Details)	Mar. 31, 2019 USD ($)
Operating leases
2019 (excluding first three months of 2019)	$ 60,000,000
2020	69,000,000
2021	65,000,000
2022	59,000,000
2023	50,000,000
Thereafter	479,000,000
Total undiscounted lease payments	782,000,000
Less: imputed interest	(275,000,000)
Total lease liabilities	507,000,000
Less: current lease liabilities	(52,000,000)
Long-term lease liabilities	455,000,000
Finance leases
2019 (excluding first three months of 2019)	146,000,000
2020	190,000,000
2021	188,000,000
2022	188,000,000
2023	188,000,000
Thereafter	2,806,000,000
Total undiscounted lease payments	3,706,000,000
Less: imputed interest	(2,429,000,000)
Total lease liabilities	1,277,000,000
Less: current lease liabilities	(21,000,000)
Long-term lease liabilities	1,256,000,000
Southern California Gas Company [Member]
Operating leases
2019 (excluding first three months of 2019)	20,000,000
2020	22,000,000
2021	20,000,000
2022	17,000,000
2023	13,000,000
Thereafter	31,000,000
Total undiscounted lease payments	123,000,000
Less: imputed interest	(13,000,000)
Total lease liabilities	110,000,000
Less: current lease liabilities	(22,000,000)
Long-term lease liabilities	88,000,000
Finance leases
2019 (excluding first three months of 2019)	3,000,000
2020	1,000,000
2021	0
2022	0
2023	0
Thereafter	1,000,000
Total undiscounted lease payments	5,000,000
Less: imputed interest	0
Total lease liabilities	5,000,000
Less: current lease liabilities	(3,000,000)
Long-term lease liabilities	2,000,000
San Diego Gas and Electric Company [Member]
Operating leases
2019 (excluding first three months of 2019)	24,000,000
2020	25,000,000
2021	24,000,000
2022	21,000,000
2023	17,000,000
Thereafter	42,000,000
Total undiscounted lease payments	153,000,000
Less: imputed interest	(19,000,000)
Total lease liabilities	134,000,000
Less: current lease liabilities	(24,000,000)
Long-term lease liabilities	110,000,000
Finance leases
2019 (excluding first three months of 2019)	143,000,000
2020	189,000,000
2021	188,000,000
2022	188,000,000
2023	188,000,000
Thereafter	2,805,000,000
Total undiscounted lease payments	3,701,000,000
Less: imputed interest	(2,429,000,000)
Total lease liabilities	1,272,000,000
Less: current lease liabilities	(18,000,000)
Long-term lease liabilities	$ 1,254,000,000