FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2026 USD ($) $ / MWh	Dec. 31, 2025 USD ($) $ / MWh	Dec. 31, 2024 USD ($) $ / MWh	Dec. 31, 2023 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 10	$ 4	$ 10	$ 35
Realized and unrealized gains (losses), net		2	(10)
Allocated transmission instruments		8	3	(1)
Settlements		(4)	1	(7)
Balance at end of period		10	4	10
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		0	(4)	(13)
Commodity contracts not subject to rate recovery
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at January 1	(55)	0
Transfer from Level 2 to Level 3		(55)
Balance at December 31		(55)	0
Change in unrealized gains (losses) relating to instruments still held at December 31		0
Other Sempra
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	41	25	23	17
Realized and unrealized gains		24	11	15
Settlements		(8)	(9)	(9)
Ending balance		41	25	23
Change in unrealized gains (losses) relating to instruments still held at December 31		$ 24	$ 8	$ 13
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest Expense, Nonoperating, Interest income	Interest Expense, Nonoperating, Interest income	Interest Expense, Nonoperating, Interest income
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest Expense, Nonoperating, Interest income	Interest Expense, Nonoperating, Interest income	Interest Expense, Nonoperating, Interest income
SDG&E
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	10	$ 4	$ 10	$ 35
Realized and unrealized gains (losses), net		2	(10)	(17)
Allocated transmission instruments		8	3	(1)
Settlements		(4)	1	(7)
Balance at end of period		10	4	10
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		0	(4)	$ (13)
Other Sempra | Other Current Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	8	7
Ending balance		8	7
Other Sempra | Other long-term assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 33	18
Ending balance		$ 33	$ 18
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		(7.38)	(3.69)
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	(0.31)
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		15.54	9.55
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	13.76
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		0.01	(0.44)
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	4.05