COMMITMENTS AND CONTINGENCIES - LEASE INCOME STATEMENT INFORMATION (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 96
Amortization of ROU assets	24
Interest on lease liabilities	173
Total finance lease costs	197
Short-term lease costs	6
Variable lease costs	482
Total lease costs	781
Southern California Gas Company [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	27
Amortization of ROU assets	6
Interest on lease liabilities	0
Total finance lease costs	6
Short-term lease costs	0
Variable lease costs	10
Total lease costs	43
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Operating lease costs	33
Amortization of ROU assets	18
Interest on lease liabilities	173
Total finance lease costs	191
Short-term lease costs	2
Variable lease costs	471
Total lease costs	$ 697