GENERAL INFORMATION AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	$ 42	$ 54	[1]
Total due to unconsolidated affiliates – noncurrent	(303)	(301)	[1]
Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	42	54
Total due to unconsolidated affiliates – current	(5)	0	[1]
Various affiliates
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	8	13
Tax Sharing Arrangement | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	34	41
TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(5)	0
San Diego Gas and Electric Company
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	8	0	[1]
San Diego Gas and Electric Company | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	8	0
Total due to unconsolidated affiliates – current	(49)	(135)	[1]
San Diego Gas and Electric Company | Various affiliates
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(11)	(14)
San Diego Gas and Electric Company | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(38)	(49)
Income taxes due (to) from Sempra	(43)	10
San Diego Gas and Electric Company | Due to/from SoCalGas
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	8	0
Total due to unconsolidated affiliates – current	0	(72)
Southern California Gas Company
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	1	77	[1]
Southern California Gas Company | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	1	77
Total due to unconsolidated affiliates – current	(38)	(36)	[1]
Southern California Gas Company | Various affiliates
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	1	5
Southern California Gas Company | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(30)	(36)
Income taxes due (to) from Sempra	(6)	(16)
Southern California Gas Company | Due to/from SDG&E
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	0	72
Total due to unconsolidated affiliates – current	(8)	0
Sempra Infrastructure | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – noncurrent	$ (303)	(301)
Five Point Five Percent Note Due January 2024 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ 0	(40)
Five Point Five Percent Note Due January 2025 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (24)	(23)
Five Point Five Percent Notes Due July 2025 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (22)	(21)
Five Point Five Percent Note due January 2026 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (20)	(19)
Five Point Five Percent Note due July 2026 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (11)	(11)
Five Point Five Percent Note due January 2027 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (14)	0
Five Point Five Percent Note due July 2027 | Sempra Infrastructure | TAG Pipeline Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (17)	0
Five Point Seven Four Percent Note December 2029 | Sempra Infrastructure | TAG | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.74%
Total due to unconsolidated affiliates – noncurrent	$ (195)	$ (187)

[1] Derived from audited financial statements.