GENERAL INFORMATION AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details)	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)		Dec. 31, 2021 MXN ($)
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current		$ 52,000,000	$ 23,000,000	[1]
Due from unconsolidated affiliates - noncurrent		0	637,000,000	[1]
Due to unconsolidated affiliates - noncurrent		(296,000,000)	(287,000,000)	[1]
Maximum borrowing capacity		9,535,000,000
Tax Sharing Arrangement
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current		41,000,000	18,000,000
Various affiliates
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current		11,000,000	5,000,000
San Diego Gas and Electric Company
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, current		(93,000,000)	(97,000,000)	[1]
Maximum borrowing capacity		1,500,000,000
San Diego Gas and Electric Company | Various affiliates
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, current		(5,000,000)	(9,000,000)
San Diego Gas and Electric Company | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, current		(64,000,000)	(40,000,000)
Income taxes due from Sempra Energy		37,000,000	19,000,000
San Diego Gas and Electric Company | Due to/from SoCalGas
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, current		(24,000,000)	(48,000,000)
Southern California Gas Company
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current		24,000,000	49,000,000	[1]
Due to unconsolidated affiliates, current		(42,000,000)	(36,000,000)	[2]
Maximum borrowing capacity		750,000,000
Southern California Gas Company | Various affiliates
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current		0	1,000,000
Southern California Gas Company | Due to/from Sempra Energy
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, current		(42,000,000)	(36,000,000)
Income taxes due from Sempra Energy		9,000,000	6,000,000
Southern California Gas Company | Due to/from SDG&E
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current		24,000,000	48,000,000
Sempra Infrastructure
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - noncurrent		(296,000,000)	(287,000,000)
Debt amount	$ 625,000,000
Sempra Infrastructure | IMG
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent		$ 0	637,000,000
Due from affiliates, allowance for credit loss			1,000,000
Maximum borrowing capacity			691,000,000		$ 14,200,000,000
Accrued interest receivable			$ 2,000,000
Sempra Infrastructure | IMG | Interbank Equilibrium Rate
Related Party Transaction [Line Items]
Spread on variable rate (as a percent)			2.20%
Interest rate on due from affiliate, current			8.06%
Sempra Infrastructure | IMG | Secured Overnight Financing Rate
Related Party Transaction [Line Items]
Spread on variable rate (as a percent)	1.80%
Five Point Five Percent Note Due January 2024 | Sempra Infrastructure | TAG Pipeline Norte
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)		5.50%
Due to unconsolidated affiliates - noncurrent		$ (39,000,000)	$ (69,000,000)
Five Point Five Percent Note Due January 2025 | Sempra Infrastructure | TAG Pipeline Norte
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)		5.50%
Due to unconsolidated affiliates - noncurrent		$ (22,000,000)	(21,000,000)
Five Point Five Percent Notes Due July 2025 | Sempra Infrastructure | TAG Pipeline Norte
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)		5.50%
Due to unconsolidated affiliates - noncurrent		$ (21,000,000)	(20,000,000)
Five Point Five Percent Note due January 2026 | Sempra Infrastructure | TAG Pipeline Norte
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)		5.50%
Due to unconsolidated affiliates - noncurrent		$ (18,000,000)	0
Five Point Five Percent Note due July 2026 | Sempra Infrastructure | TAG Pipeline Norte
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)		5.50%
Due to unconsolidated affiliates - noncurrent		$ (11,000,000)	0
Five Point Seven Four Percent Note December 2029 | Sempra Infrastructure | TAG
Related Party Transaction [Line Items]
Stated rate of debt (as a percent)		5.74%
Due to unconsolidated affiliates - noncurrent		$ (185,000,000)	$ (177,000,000)

[1] Derived from audited financial statements.

[2] Derived from audited financial statements.