GENERAL INFORMATION AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Natural gas	$ 129	$ 164
LNG	22	27
Materials and supplies	201	198
Total	352	389	[1]
San Diego Gas and Electric Company
Inventory [Line Items]
Natural gas	0	0
LNG	0	0
Materials and supplies	123	123
Total	123	123	[1]
Southern California Gas Company
Inventory [Line Items]
Natural gas	87	114
LNG	0	0
Materials and supplies	62	58
Total	$ 149	$ 172	[1]

[1] Derived from audited financial statements.