COMMITMENTS AND CONTINGENCIES - RENT EXPENSE OPERATING LEASES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Rent expense	$ 122
Capital lease depreciation expense	11
Depreciation expense on leases	8
San Diego Gas and Electric Company [Member]
Operating Leased Assets [Line Items]
Rent expense	27
Capital lease depreciation expense	11
Depreciation expense on leases	2
Southern California Gas Company [Member]
Operating Leased Assets [Line Items]
Rent expense	41
Depreciation expense on leases	$ 6