GENERAL INFORMATION AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	$ 46	$ 31	[1]
Total due to unconsolidated affiliates – noncurrent	(298)	(307)	[1]
Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	46	31
Total due to unconsolidated affiliates – current	0	(5)	[1]
Total due to unconsolidated affiliates – noncurrent	(298)	(307)
Various affiliates
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	41	25
SDG&E | Related Party
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(93)	(73)	[1]
SDG&E | Various affiliates
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(13)	(8)
SDG&E | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(39)	(44)
Income taxes due (to) from Sempra	232	246
SDG&E | Due to/from SoCalGas
Related Party Transaction [Line Items]
Total due to unconsolidated affiliates – current	(41)	(21)
SoCalGas
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	45	22	[1]
SoCalGas | Related Party
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	45	22
Total due to unconsolidated affiliates – current	(33)	(38)	[1]
SoCalGas | Various affiliates
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	(33)	(38)
Income taxes due (to) from Sempra	4	6
SoCalGas | Due to/from SDG&E
Related Party Transaction [Line Items]
Due from unconsolidated affiliates	43	21
Five Point Five Percent Note Due January 2024 | TAG Pipeline | 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 Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ 0	(24)
Five Point Five Percent Notes Due July 2025 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ 0	(23)
Five Point Five Percent Note due January 2026 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (8)	(20)
Five Point Five Percent Note due July 2026 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (12)	(11)
Five Point Five Percent Note due January 2027 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (15)	(14)
Five Point Five Percent Note due July 2027 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (18)	(17)
Five Point Seven Four Percent Note December 2029 | TAG JV Norte | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.74%
Total due to unconsolidated affiliates – noncurrent	$ (200)	(198)
Five Point Five Percent Note due January 2028 | TAG Pipeline | Related Party
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)	5.50%
Total due to unconsolidated affiliates – noncurrent	$ (45)	$ 0

[1] Derived from audited financial statements.