SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	$ 13	$ 31
Due to unconsolidated affiliates, noncurrent	(352)	(307)
Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	13	31
Total due to unconsolidated affiliates – current	0	(5)
Due to unconsolidated affiliates, noncurrent	(352)	(307)
Other related parties
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	5	6
Tax Sharing Arrangement | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	8	25
SDG&E | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(59)	(73)
SDG&E | Other related parties
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(3)	(8)
SDG&E | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(42)	(44)
SDG&E | Due to/from SoCalGas
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(14)	(21)
SoCalGas
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	16	22
SoCalGas | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	16	22
Total due to unconsolidated affiliates – current	(38)	(38)
SoCalGas | Other related parties
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	2	1
SoCalGas | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(38)	(38)
Income taxes due from (to) Sempra	(6)	6
SoCalGas | Due to/from SDGE
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	14	21
SDG&E and SoCalGas | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(59)	(73)
SDG&E and SoCalGas | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Income taxes due from (to) Sempra	38	246
Five Point Five Percent Note Due January 2024 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	$ 0	(5)
Stated rate of debt (as a percent)	5.50%
Five Point Five Percent Note Due January 2025 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ 0	(24)
Five Point Five Percent Note due July 2025 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ 0	(23)
Five Point Five Percent Note due January 2026 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ (8)	(20)
Five Point Five Percent Note due July 2026 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ (12)	(11)
Five Point Five Percent Note due January 2027 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ (15)	(14)
Five Point Five Percent Note due July 2027 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ (19)	(17)
Five Point Five Percent Note Due January 2028 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ (48)	0
Five Point Five Percent Note Due July 2028 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Due to unconsolidated affiliates, noncurrent	$ (41)	0
Five Point Seven Four Percent Note December 2029 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, noncurrent	$ (209)	$ (198)
Five Point Seven Four Percent Note December 2029 | TAG JV Notes | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.74%