GENERAL INFORMATION AND OTHER FINANCIAL DATA - INVENTORIES (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Inventory [Line Items]
Natural gas	$ 134	$ 158
Materials and supplies	396	403
Total	530	561	[1]
SI Partners | Disposal Group Held-for-sale
Inventory [Line Items]
Inventories classified as assets held for sale	104	109
SI Partners | Disposal Group Held-for-sale | Natural gas
Inventory [Line Items]
Inventories classified as assets held for sale	8	12
SI Partners | Disposal Group Held-for-sale | LNG
Inventory [Line Items]
Inventories classified as assets held for sale	4	12
SI Partners | Disposal Group Held-for-sale | Materials and supplies
Inventory [Line Items]
Inventories classified as assets held for sale	92	85
SDG&E
Inventory [Line Items]
Natural gas	2	2
Materials and supplies	261	265
Total	263	267	[2]
SoCalGas
Inventory [Line Items]
Natural gas	132	156
Materials and supplies	135	138
Total	$ 267	$ 294	[3]

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.

[3] Derived from audited financial statements.