COMMITMENTS AND CONTINGENCIES - LEGAL PROCEEDINGS (Details) £ in Millions			1 Months Ended					12 Months Ended
	Feb. 18, 2022 lawsuit plaintiff	Nov. 04, 2021 USD ($)	Sep. 30, 2021 USD ($)	Oct. 31, 2020 GBP (£)	Nov. 30, 2019 customer	Oct. 31, 2018 plaintiff	Jan. 31, 2017 lawsuit	Dec. 31, 2021 USD ($) claim lawsuit	Dec. 31, 2021 GBP (£)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 27, 2021 USD ($)	Sep. 26, 2021 USD ($)	Aug. 31, 2017 lawsuit	Oct. 31, 2014 USD ($)	Oct. 31, 2014 GBP (£)
Loss Contingencies [Line Items]
Loss contingency accrual								$ 2,086,000,000
Number of alleged violations | customer					324
Reserve for Aliso Canyon costs								1,532,000,000		$ 141,000,000	$ (144,000,000)
Reserve for Aliso Canyon costs								1,980,000,000		150,000,000	9,000,000
Income (loss) from equity method investments								614,000,000		294,000,000	30,000,000
Renewable energy transmission and consumption permits
Loss Contingencies [Line Items]
Other intangible assets, net related to self-supply permits								14,000,000
Gas Transmission [Member]
Loss Contingencies [Line Items]
Net book value of pipeline								432,000,000
SoCalGas
Loss Contingencies [Line Items]
Loss contingency accrual								2,006,000,000
Recoverable costs through insurance settlement								1,279,000,000
Reserve for Aliso Canyon costs								1,532,000,000		141,000,000	(144,000,000)
Reserve for Aliso Canyon costs								1,980,000,000		150,000,000	$ 9,000,000
Proceeds from contribution from parent			$ 800,000,000
San Diego Gas and Electric Company [Member]
Loss Contingencies [Line Items]
Loss contingency accrual								$ 4,000,000
Energy Future Holdings Corp. [Member]
Loss Contingencies [Line Items]
Proof of claims | claim								28,000
Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Loss contingency accrual										484,000,000
Net book value Of Aliso Canyon Natural Gas Storage Facility								$ 883,000,000
Recorded estimated costs								3,221,000,000
Reserve for Aliso Canyon costs								1,983,000,000
Insurance receivable for Aliso Canyon costs								360,000,000
Proceeds from insurance settlement								919,000,000
Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | Sempra Energy and Southern California Gas Company [Member]
Loss Contingencies [Line Items]
Loss contingency accrual								$ 1,980,000,000
Shareholder Derivative Complaint [Member] | SoCalGas
Loss Contingencies [Line Items]
Number of pending claims | lawsuit								4						3
HMRC VAT Claim [Member] | R B S Sempra Commodities
Loss Contingencies [Line Items]
VAT tax claim paid upon appeal															$ 138,000,000
HMRC VAT Claim [Member] | Plaintiffs [Member]
Loss Contingencies [Line Items]
Damage awarded								$ 61,000,000	£ 45
Loss Contingency, Costs And Interest Assessed				£ 21				28,000,000
HMRC VAT Claim [Member] | Parent Company
Loss Contingencies [Line Items]
VAT tax claim paid upon appeal | £																£ 86
Consolidated Class Action Complaints [Member]
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit							2
Property Class Action [Member]
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit							1
Property Class Action [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Estimate of possible loss													$ 40,000,000
Complaints Filed by Firefighters [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff						51
R B S Sempra Commodities
Loss Contingencies [Line Items]
Energy Efficiency Program Inquiry fines that reduce revenue								50,000,000
Income (loss) from equity method investments										100,000,000
Individual Plaintiff Litigation | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Percentage of plaintiffs represented (as a percent)													80.00%
Estimate of possible loss													$ 1,800,000,000
Acceptance rate of plaintiffs (as a percent)													97.00%
Business Class Action | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Estimate of possible loss												$ 100,000
Proposition 65 Claims | SoCalGas
Loss Contingencies [Line Items]
Energy Efficiency Program Inquiry fines that reduce revenue		$ 2,000,000
Subsequent Event | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Number of pending claims | lawsuit	390
Number of plaintiffs | plaintiff	36,000
Insurance Receivable for Aliso Canyon Costs [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Loss contingency accrual										177,000,000
Aliso Canyon Litigation and Regulatory Matters [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member]
Loss Contingencies [Line Items]
Loss contingency accrual										307,000,000
Aliso Canyon Litigation and Regulatory Matters [Member] | Aliso Canyon Natural Gas Storage Facility Gas Leak [Member] | SoCalGas
Loss Contingencies [Line Items]
Loss contingency accrual								1,590,000,000		307,000,000
Loss accrual, net of tax								$ 1,150,000,000		$ 233,000,000