FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) $ / MWh	Mar. 31, 2025 USD ($) $ / MWh	Dec. 31, 2025 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 10	$ 4
Realized and unrealized gains (losses), net	(3)	(1)
Allocated transmission instruments	3	2
Settlements	0	(1)
Ending balance	10	4
Change in unrealized gains (losses) relating to instruments still held at March 31	(2)	(2)
Commodity contracts not subject to rate recovery
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(55)
Realized and unrealized gains (losses), net	4
Ending balance	(51)
Change in unrealized gains (losses) relating to instruments still held at March 31	4
Other Sempra
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	41	25
Realized and unrealized gains (losses), net	2	15
Settlements	(2)	(2)
Ending balance	41	38
Change in unrealized gains (losses) relating to instruments still held at March 31	2	15
Other Sempra | Other current assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	8
Other Sempra | Other long-term assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	33
SDG&E
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	10	4
Realized and unrealized gains (losses), net	(3)	(1)
Allocated transmission instruments	3	2
Settlements	0	(1)
Ending balance	10	4
Change in unrealized gains (losses) relating to instruments still held at March 31	(2)	$ (2)
Level 3 | Disposal Group Held-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative liability, before netting	59		$ 56
Level 3 | Commodity contracts not subject to rate recovery
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative liability, before netting	59
Level 3 | Commodity contracts not subject to rate recovery | Disposal Group Held-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Derivative asset, before netting	$ 8		1
Derivative liability, before netting			$ 56
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	(0.31)	(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	13.76	15.54
Level 3 | SDG&E | Weighted Average
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	0.01