GENERAL INFORMATION AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	$ 0	$ 13	[1]
Total due to unconsolidated affiliates - noncurrent	0	(352)	[1]
SI Partners | Disposal Group Held-for-sale
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	3
Due to unconsolidated affiliates	417
Related Party
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	0	13
Total due to unconsolidated affiliates - noncurrent	0	(352)
Total due to unconsolidated affiliates – current	(17)	0	[1]
Other Affiliates
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	0	5
Tax Sharing Arrangement | Related Party
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	0	8
Total due to unconsolidated affiliates – current	(17)	0
SDG&E
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	13	0	[2]
SDG&E | Related Party
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	13	0
Total due to unconsolidated affiliates – current	(65)	(59)	[2]
SDG&E | Other Affiliates
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(8)	(3)
SDG&E | Subsidiary of common parent
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	13	0
Total due to unconsolidated affiliates – current	0	(14)
SDG&E | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(57)	(42)
Income taxes due from (to) Sempra	46	38
SoCalGas
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	2	16	[3]
SoCalGas | Related Party
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	2	16
Total due to unconsolidated affiliates – current	(62)	(38)	[3]
SoCalGas | Other Affiliates
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	2	2
SoCalGas | Subsidiary of common parent
Related Party Transaction [Line Items]
Total due from unconsolidated affiliates - current	0	14
Total due to unconsolidated affiliates – current	(13)	0
SoCalGas | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(49)	(38)
Income taxes due from (to) Sempra	20	(6)
5.5% Note due January 14, 2026 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	(8)
Stated rate of debt (as a percent)	5.50%
5.5% Note due July 14, 2026 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	(12)
Stated rate of debt (as a percent)	5.50%
5.5% Note due January 19, 2027 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	(15)
Stated rate of debt (as a percent)	5.50%
5.5% Note due July 21, 2027 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	(19)
Stated rate of debt (as a percent)	5.50%
5.5% Note due January 19, 2028 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	(48)
Stated rate of debt (as a percent)	5.50%
5.5% Note due July 18, 2028 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	(41)
Stated rate of debt (as a percent)	5.50%
5.74% Note due December 17, 2029 | TAG JV Norte | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates - noncurrent	$ 0	$ (209)
Stated rate of debt (as a percent)	5.74%

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.

[3] Derived from audited financial statements.