COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details) £ in Millions, $ in Millions		1 Months Ended	3 Months Ended		4 Months Ended	9 Months Ended		12 Months Ended			48 Months Ended
	Nov. 01, 2024 plaintiff claim lawsuit	Sep. 30, 2021 USD ($) plaintiff lawsuit	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Feb. 11, 2016 well	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 claimant lawsuit	Jul. 31, 2024 lawsuit	Aug. 31, 2023 Bcf	Dec. 31, 2015 company
Loss Contingencies [Line Items]
Liability for legal proceedings			$ 53			$ 53
Number of liquidating companies | company														10
Equity earnings			454	$ 479		1,235	$ 1,086
Sempra Infrastructure
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit												2
Number of claimants | claimant											3
Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit		390
Number of lawsuits | plaintiff		36,000
HMRC VAT Claim
Loss Contingencies [Line Items]
Damages awarded								$ 10	£ 7.9
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%
Non-Settling Individual Plaintiffs | Aliso Canyon Natural Gas Storage Facility Gas Leak | Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits | plaintiff	520
RBS Sempra Commodities
Loss Contingencies [Line Items]
Equity earnings								$ 40
SoCalGas
Loss Contingencies [Line Items]
Liability for legal proceedings			28			28
Wells with gas leak | well					1
Natural gas inventory level (in bcf) | Bcf													68.6
SoCalGas | Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit		390
Number of lawsuits | plaintiff		36,000
Net book value of Aliso Canyon facility			1,000			1,000
SoCalGas | 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
SoCalGas | Non-Settling Individual Plaintiffs | Aliso Canyon Natural Gas Storage Facility Gas Leak | Subsequent Event
Loss Contingencies [Line Items]
Number of lawsuits | plaintiff	520
SDG&E
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit											2
Energy Future Holdings Corp. | Subsequent Event
Loss Contingencies [Line Items]
Lawsuits pending | lawsuit	1
Number of proof of claims | claim	28,000
Deferred Credits and Other | Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Payable related to natural gas leak			1			1
Deferred Credits and Other | SoCalGas | Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Payable related to natural gas leak			1			1
Other current liabilities | Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Payable related to natural gas leak			21			21
Other current liabilities | SoCalGas | Aliso Canyon Natural Gas Storage Facility Gas Leak
Loss Contingencies [Line Items]
Payable related to natural gas leak			$ 21			$ 21