COMMITMENTS AND CONTINGENCIES - LESSEE BALANCE SHEET INFORMATION (Details)	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 600,000,000
Property, plant and equipment	1,331,000,000
Accumulated depreciation	(51,000,000)
Property, plant and equipment, net	1,280,000,000
Total right-of-use assets	1,880,000,000
Other current liabilities	49,000,000
Deferred credits and other	450,000,000
Total operating lease liabilities	499,000,000
Current portion of long-term debt and finance leases	23,000,000
Long-term debt and finance leases	1,257,000,000
Total finance lease liabilities	1,280,000,000
Total lease liabilities	$ 1,779,000,000
Operating leases, Weighted-average remaining lease term (in years)	14 years
Finance leases, Weighted-average remaining lease term (in years)	20 years
Operating leases, Weighted-average discount rate	5.90%
Finance leases, Weighted-average discount rate	14.86%
San Diego Gas and Electric Company [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 132,000,000
Property, plant and equipment	1,317,000,000
Accumulated depreciation	(47,000,000)
Property, plant and equipment, net	1,270,000,000
Total right-of-use assets	1,402,000,000
Other current liabilities	22,000,000
Deferred credits and other	108,000,000
Total operating lease liabilities	130,000,000
Current portion of long-term debt and finance leases	19,000,000
Long-term debt and finance leases	1,251,000,000
Total finance lease liabilities	1,270,000,000
Total lease liabilities	$ 1,400,000,000
Operating leases, Weighted-average remaining lease term (in years)	7 years
Finance leases, Weighted-average remaining lease term (in years)	20 years
Operating leases, Weighted-average discount rate	3.69%
Finance leases, Weighted-average discount rate	14.90%
Southern California Gas Company [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 105,000,000
Property, plant and equipment	14,000,000
Accumulated depreciation	(4,000,000)
Property, plant and equipment, net	10,000,000
Total right-of-use assets	115,000,000
Other current liabilities	21,000,000
Deferred credits and other	84,000,000
Total operating lease liabilities	105,000,000
Current portion of long-term debt and finance leases	4,000,000
Long-term debt and finance leases	6,000,000
Total finance lease liabilities	10,000,000
Total lease liabilities	$ 115,000,000
Operating leases, Weighted-average remaining lease term (in years)	6 years
Finance leases, Weighted-average remaining lease term (in years)	5 years
Operating leases, Weighted-average discount rate	3.75%
Finance leases, Weighted-average discount rate	3.68%