FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) $ / MWh	Jun. 30, 2023 USD ($) $ / MWh
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 9	$ 30	$ 10	$ 35
Realized and unrealized gains (losses), net	(2)	(4)	(3)	(8)
Allocated transmission instruments	0	(2)	0	(2)
Settlements	(1)	(4)	(1)	(5)
Ending balance	6	20	6	20
Change in unrealized losses relating to instruments still held at June 30	(1)	(7)	(2)	(9)
Other Sempra
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23	24	23	17
Realized and unrealized gains (losses), net	2	1	4	10
Settlements	(2)	(2)	(4)	(4)
Ending balance	23	23	23	23
Change in unrealized gains relating to instruments still held at June 30	2	1	3	9
Other Sempra | Other current assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	7		7
Other Sempra | Other long-term assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	16		16
SDG&E
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	9	30	10	35
Realized and unrealized gains (losses), net	(2)	(4)	(3)	(8)
Allocated transmission instruments	0	(2)	0	(2)
Settlements	(1)	(4)	(1)	(5)
Ending balance	6	20	6	20
Change in unrealized losses relating to instruments still held at June 30	$ (1)	$ (7)	$ (2)	$ (9)
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)
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
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			(0.44)	(0.56)