FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) $ / MWh	Jun. 30, 2022 USD ($) $ / MWh	Jun. 30, 2023 USD ($) $ / MWh	Jun. 30, 2022 USD ($) $ / MWh
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 30	$ 58	$ 35	$ 54
Realized and unrealized losses	(4)	(30)	(8)	(23)
Allocated transmission instruments	(2)	(6)	(2)	(6)
Settlements	(4)	11	(5)	8
Ending balance	20	33	20	33
Change in unrealized losses relating to instruments still held at June 30	(7)	(23)	(9)	(18)
Sempra Infrastructure
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	24	12	17	7
Realized and unrealized gains	1	6	10	14
Settlements	(2)	(2)	(4)	(5)
Ending balance	23	16	23	16
Change in unrealized gains (losses) relating to instruments still held at the end of the period	1	5	9	13
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	16		16
San Diego Gas and Electric Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	30	58	35	54
Realized and unrealized losses	(4)	(30)	(8)	(23)
Allocated transmission instruments	(2)	(6)	(2)	(6)
Settlements	(4)	11	(5)	8
Ending balance	20	33	20	33
Change in unrealized losses relating to instruments still held at June 30	$ (7)	$ (23)	$ (9)	$ (18)
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	22.75	25.25	22.75	25.25
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	117.50	125.00	117.50	125.00
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	74.02	66.36	74.02	66.36