COMMITMENTS AND CONTINGENCIES - LESSEE STATEMENT OF OPERATIONS INFORMATION (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 24,000,000
Amortization of ROU assets	5,000,000
Interest on lease liabilities	47,000,000
Total finance lease costs	52,000,000
Short-term lease costs	1,000,000
Variable lease costs	92,000,000
Total lease costs	169,000,000
Southern California Gas Company [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	7,000,000
Amortization of ROU assets	1,000,000
Interest on lease liabilities	0
Total finance lease costs	1,000,000
Short-term lease costs	0
Variable lease costs	2,000,000
Total lease costs	10,000,000
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	8,000,000
Amortization of ROU assets	4,000,000
Interest on lease liabilities	47,000,000
Total finance lease costs	51,000,000
Short-term lease costs	0
Variable lease costs	90,000,000
Total lease costs	$ 149,000,000