FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) $ / MWh	Sep. 30, 2023 USD ($) $ / MWh	Sep. 30, 2022 USD ($) $ / MWh
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 20	$ 33	$ 35	$ 54
Realized and unrealized losses	(2)	(35)	(10)	(58)
Allocated transmission instruments	1	2	(1)	(4)
Settlements	(1)	33	(6)	41
Ending balance	18	33	18	33
Change in unrealized losses relating to instruments still held at September 30	1	3	(8)	(15)
Sempra Infrastructure
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23	16	17	7
Realized and unrealized gains	(3)	2	7	16
Settlements	(2)	(2)	(6)	(7)
Ending balance	18	16	18	16
Change in unrealized gains (losses) relating to instruments still held at the end of the period	(2)	2	7	15
Sempra Infrastructure | Other current assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	7		7
Sempra Infrastructure | Other long-term assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	11		11
San Diego Gas and Electric Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	20	33	35	54
Realized and unrealized losses	(2)	(35)	(10)	(58)
Allocated transmission instruments	1	2	(1)	(4)
Settlements	(1)	33	(6)	41
Ending balance	18	33	18	33
Change in unrealized losses relating to instruments still held at September 30	$ 1	$ 3	$ (8)	$ (15)
Level 3 | San Diego Gas and Electric Company | 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		26.75		26.75
Level 3 | San Diego Gas and Electric Company | 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		127.20		127.20
Level 3 | San Diego Gas and Electric Company | 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			(0.56)	(0.70)
Market electricity forward price inputs ( in dollars per MWH) | $ / MWh		68.50		68.50