COMMITMENTS AND CONTINGENCIES - LEASES CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Cash paid for operating leases	$ 78	$ 79	$ 101
Cash paid for finance leases	171	173	173
Cash paid for finance leases	39	35	24
Increase (decrease) in operating lease obligations for ROU assets	116	20	585
Increase in finance lease obligations for investment in PP&E	43	77	38
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Cash paid for operating leases	32	31	33
Cash paid for finance leases	169	171	173
Cash paid for finance leases	27	23	18
Increase (decrease) in operating lease obligations for ROU assets	112	(1)	158
Increase in finance lease obligations for investment in PP&E	24	30	16
SoCalGas
Lessee, Lease, Description [Line Items]
Cash paid for operating leases	20	24	27
Cash paid for finance leases	2	2	0
Cash paid for finance leases	12	12	6
Increase (decrease) in operating lease obligations for ROU assets	1	1	118
Increase in finance lease obligations for investment in PP&E	$ 19	$ 47	$ 22