GENERAL INFORMATION AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	$ 31	$ 54
Total due to unconsolidated affiliates – current	(307)	(301)
Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	31	54
Total due to unconsolidated affiliates – current	(5)	0
Total due to unconsolidated affiliates – current	(307)	(301)
Other related parties
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	6	13
Tax Sharing Arrangement | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	25	41
SDG&E | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(73)	(135)
SDG&E | Other related parties
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(8)	(14)
SDG&E | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(44)	(49)
Income taxes due from (to) Sempra	246	10
SDG&E | Due to/from SoCalGas
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(21)	(72)
SoCalGas
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	22	77
SoCalGas | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	22	77
Total due to unconsolidated affiliates – current	(38)	(36)
SoCalGas | Other related parties
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	1	5
SoCalGas | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(38)	(36)
Income taxes due from (to) Sempra	6	(16)
SoCalGas | Due to/from SDGE
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	21	72
Five Point Five Percent Note Due January 2024 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	$ (5)	0
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – current	$ 0	(40)
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%
Total due to unconsolidated affiliates – current	$ (24)	(23)
Five Point Five Percent Notes Due July 2025 | TAG Pipelines Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – current	$ (23)	(21)
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%
Total due to unconsolidated affiliates – current	$ (20)	(19)
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%
Total due to unconsolidated affiliates – current	$ (11)	(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%
Total due to unconsolidated affiliates – current	$ (14)	0
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%
Total due to unconsolidated affiliates – current	$ (17)	0
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%
Total due to unconsolidated affiliates – current	$ (198)	$ (187)