GENERAL INFORMATION AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Natural gas	$ 150	$ 174
LNG	3	9
Materials and supplies	305	299
Total	458	482	[1]
SDG&E
Inventory [Line Items]
Natural gas	1	1
LNG	0	0
Materials and supplies	153	152
Total	154	153	[1]
SoCalGas
Inventory [Line Items]
Natural gas	139	155
LNG	0	0
Materials and supplies	126	122
Total	$ 265	$ 277	[1]

[1] Derived from audited financial statements.