GENERAL INFORMATION AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Inventory [Line Items]
Natural gas	$ 162	$ 163
LNG	0	27
Materials and supplies	403	369
Total	565	559	[1]
SI Partners | Disposal Group Held-for-sale
Inventory [Line Items]
Inventories classified as assets held for sale	103
SI Partners | Disposal Group Held-for-sale | Natural gas
Inventory [Line Items]
Inventories classified as assets held for sale	10
SI Partners | Disposal Group Held-for-sale | LNG
Inventory [Line Items]
Inventories classified as assets held for sale	11
SI Partners | Disposal Group Held-for-sale | Materials and supplies
Inventory [Line Items]
Inventories classified as assets held for sale	82
SDG&E
Inventory [Line Items]
Natural gas	2	1
LNG	0	0
Materials and supplies	261	201
Total	263	202	[2]
SoCalGas
Inventory [Line Items]
Natural gas	160	148
LNG	0	0
Materials and supplies	142	139
Total	$ 302	$ 287	[3]

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.

[3] Derived from audited financial statements.