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Natural Gas Inventory Level, Maximum

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Number Of Claimants

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Reserve for Aliso Canyon costs.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Number of claims dismissed.

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Amount of damages paid to the plaintiff in the legal matter.

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) $ in Millions	1 Months Ended			3 Months Ended		4 Months Ended	9 Months Ended		12 Months Ended	25 Months Ended	48 Months Ended
	Oct. 31, 2023 plaintiff	Sep. 30, 2021 USD ($) lawsuit plaintiff	Jan. 31, 2021 lawsuit	Sep. 30, 2023 USD ($) lawsuit	Sep. 30, 2022 USD ($)	Feb. 11, 2016 well	Sep. 30, 2023 USD ($) segment lawsuit	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Oct. 31, 2023 plaintiff	Dec. 31, 2021 claimant lawsuit	Aug. 31, 2023 Bcf	Nov. 30, 2021 Bcf	Mar. 31, 2021 lawsuit
Loss Contingencies [Line Items]
Liability for legal proceedings				$ 203			$ 203
Natural gas inventory level (in bcf) \| Bcf												68.6	41.16
Aliso Canyon litigation and regulatory matters				0	$ 122		$ 0	$ 259
Number of reportable segments \| segment							4
Sempra Infrastructure
Loss Contingencies [Line Items]
Number of lawsuits \| lawsuit														3
Number of claimants \| claimant											3
Number of reportable segments \| segment							2
Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Liability for legal proceedings				125			$ 125
Southern California Gas Company
Loss Contingencies [Line Items]
Liability for legal proceedings				127			127
Wells with gas leak \| well						1
Aliso Canyon litigation and regulatory matters				0	122		0	259
Southern California Gas Company \| Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Liability for legal proceedings				125			125
Number of lawsuits \| lawsuit		390
Number of plaintiffs \| plaintiff		36,000
Net book value of Aliso Canyon facility				993			993
Aliso Canyon litigation and regulatory matters, net of tax					$ 101			$ 199
Reserve for Aliso Canyon costs				$ 126			$ 126
Southern California Gas Company \| Aliso Canyon Natural Gas Storage Facility Gas Leak \| Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff	233
Southern California Gas Company \| Shareholder Derivative Complaint
Loss Contingencies [Line Items]
Number of lawsuits \| lawsuit				4			4
Claims dismissed \| lawsuit			3
Southern California Gas Company \| Individual Plaintiff Litigation \| Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Estimate of costs		$ 1,800
Percentage of plaintiffs agreeing to participate and submit releases (in percent)									99.00%
Payment of liquidating companies' costs									$ 1,790
Southern California Gas Company \| The Developer Plaintiffs \| Aliso Canyon Natural Gas Storage Facility Gas Leak \| Subsequent Event
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff										394
San Diego Gas and Electric Company
Loss Contingencies [Line Items]
Number of lawsuits \| lawsuit											2
Deferred Credits and Other \| Southern California Gas Company \| Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Reserve for Aliso Canyon costs				$ 3			$ 3