COMMITMENTS AND CONTINGENCIES - LEASE INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Lessee, Lease, Description [Line Items]
Interest income	$ 2	$ 0
Total revenues from sales-type leases(1)	2	0
Fixed lease payments	70	53
Variable lease payments	1	0
Total revenues from operating leases(1)	71	53
Depreciation expense	13	$ 10
San Diego Gas and Electric Company
Lessee, Lease, Description [Line Items]
Lease not yet commenced, remainder of year	8
Lease not yet commenced, year one	17
Lease not yet commenced, year two	18
Lease not yet commenced, year three	18
Lease not yet commenced, year four	18
Lease not yet commenced, thereafter	101
Southern California Gas Company
Lessee, Lease, Description [Line Items]
Finance lease not yet commenced, year one	2
Finance lease not yet commenced, year two	2
Finance lease not yet commenced, year three	2
Finance lease not yet commenced, year four	2
Finance lease not yet commenced, year thereafter	$ 10