COMMITMENTS AND CONTINGENCIES - LESSEE STATEMENT OF OPERATIONS INFORMATION (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 25,000,000	$ 49,000,000
Amortization of ROU assets	6,000,000	11,000,000
Interest on lease liabilities	47,000,000	94,000,000
Total finance lease costs	53,000,000	105,000,000
Short-term lease costs	1,000,000	2,000,000
Variable lease costs	148,000,000	240,000,000
Total lease costs	227,000,000	396,000,000
Southern California Gas Company [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	7,000,000	14,000,000
Amortization of ROU assets	1,000,000	2,000,000
Interest on lease liabilities	0	0
Total finance lease costs	1,000,000	2,000,000
Short-term lease costs	0	0
Variable lease costs	4,000,000	6,000,000
Total lease costs	12,000,000	22,000,000
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	9,000,000	17,000,000
Amortization of ROU assets	5,000,000	9,000,000
Interest on lease liabilities	47,000,000	94,000,000
Total finance lease costs	52,000,000	103,000,000
Short-term lease costs	0	0
Variable lease costs	144,000,000	234,000,000
Total lease costs	$ 205,000,000	$ 354,000,000