COMMITMENTS AND CONTINGENCIES - LESSEE CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Increase in operating lease obligations for right-of-use assets	$ 21	$ 559
Increase in finance lease obligations for investment in PP&E	56	16
Aggregate maximum lease limit	232
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Increase in operating lease obligations for right-of-use assets	0	146
Increase in finance lease obligations for investment in PP&E	20	7
Aggregate maximum lease limit, utilized	65
Southern California Gas Company [Member]
Lessee, Lease, Description [Line Items]
Increase in operating lease obligations for right-of-use assets	2	117
Increase in finance lease obligations for investment in PP&E	36	$ 9
Aggregate maximum lease limit, utilized	$ 89