FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) $ / MWh	Dec. 31, 2023 USD ($) $ / MWh	Dec. 31, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Cost of electric fuel and purchased power
Fair value, net derivative asset, liability, recurring basis, still held, unrealized gain loss, statement of income, extensible list, not disclosed, flag		Change in unrealized losses relating to instruments still held at December 31
Other Sempra
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 23	$ 17	$ 7	$ 3
Realized and unrealized gains		15	19	11
Settlements		(9)	(9)	(7)
Ending balance		23	17	7
Change in unrealized gains relating to instruments still held at December 31		13	18	11
Level 3
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	10	35	54	69
Realized and unrealized losses		(17)	(56)	(50)
Allocated transmission instruments		(1)	(4)	3
Settlements		(7)	41	32
Balance at end of period		10	35	54
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		(13)	(10)	(16)
Level 3 | SDG&E
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 10	35	54	69
Realized and unrealized losses		(17)	(56)	(50)
Allocated transmission instruments		(1)	(4)	3
Settlements		(7)	41	32
Balance at end of period		10	35	54
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		$ (13)	$ (10)	(16)
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		(3.09)	(3.67)
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	(3.69)
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		10.71	6.96
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	9.55
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		(0.56)	(0.70)
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	(0.44)
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	$ 7
Ending balance		7	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	$ 16	10
Ending balance		$ 16	$ 10