FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) $ / MWh	Mar. 31, 2024 USD ($) $ / MWh
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 4	$ 10
Realized and unrealized gains (losses), net	(1)	(1)
Allocated transmission instruments	2	0
Settlements	(1)	0
Ending balance	4	9
Change in unrealized losses relating to instruments still held at March 31	(2)	0
Other Sempra
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	25	23
Realized and unrealized gains (losses), net	15	2
Settlements	(2)	(2)
Ending balance	38	23
Change in unrealized gains relating to instruments still held at March 31	15	1
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	30
SDG&E
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	4	10
Realized and unrealized gains (losses), net	(1)	(1)
Allocated transmission instruments	2	0
Settlements	(1)	0
Ending balance	4	9
Change in unrealized losses relating to instruments still held at March 31	$ (2)	$ 0
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 | 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 | 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	0.01	(0.44)