GENERAL INFORMATION AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Natural gas	$ 160	$ 106
LNG	9	62
Materials and supplies	282	235
Total	451	403	[1]
San Diego Gas and Electric Company
Inventory [Line Items]
Natural gas	1	1
LNG	0	0
Materials and supplies	146	133
Total	147	134	[1]
Southern California Gas Company
Inventory [Line Items]
Natural gas	144	74
LNG	0	0
Materials and supplies	116	85
Total	$ 260	$ 159	[1]

[1] Derived from audited financial statements.