FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) $ / MWh	Dec. 31, 2024 USD ($) $ / MWh	Dec. 31, 2023 USD ($) $ / MWh	Dec. 31, 2022 USD ($) $ / MWh
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleListNotDisclosedFlag		Realized and unrealized gains (losses), net
Other Sempra
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 25	$ 23	$ 17	$ 7
Realized and unrealized gains		11	15	19
Settlements		(9)	(9)	(9)
Ending balance		25	23	17
Change in unrealized gains relating to instruments still held at December 31		8	13	18
Level 3 | SDG&E
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 4	10	35	54
Realized and unrealized gains (losses), net		(10)	(17)	(56)
Allocated transmission instruments		3	(1)	(4)
Settlements		1	(7)	41
Balance at end of period		4	10	35
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		$ (4)	$ (13)	$ (10)
Level 3 | SDG&E | Minimum
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		(3.69)	(3.09)
Market electricity forward price inputs (in dollars per MWH) | $ / MWh				33.45
Level 3 | SDG&E | Minimum | Forecast
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh	(7.38)
Level 3 | SDG&E | Maximum
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		9.55	10.71
Market electricity forward price inputs (in dollars per MWH) | $ / MWh				274.70
Level 3 | SDG&E | Maximum | Forecast
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh	15.54
Level 3 | SDG&E | Median
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		(0.44)	(0.56)
Level 3 | SDG&E | Median | Forecast
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh	0.01
Level 3 | SDG&E | Weighted Average
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Market electricity forward price inputs (in dollars per MWH) | $ / MWh				85.64
Level 3 | Other Sempra | Other Current Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 7	$ 7
Ending balance		7	$ 7
Level 3 | Other Sempra | Other long-term assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 18	16
Ending balance		$ 18	$ 16