FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($) $ / MWh	Dec. 31, 2020 USD ($) $ / MWh	Dec. 31, 2019 USD ($) $ / MWh
Sempra Infrastructure
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 7	$ 3	$ 0
Realized and unrealized gains		11	6
Settlements		(7)	(3)
Ending balance		7	3	$ 0
Change in unrealized gains (losses) relating to instruments still held at the end of the period		11	3
Level 3 | San Diego Gas and Electric Company [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 54	69	28	179
Realized and unrealized (losses) gains		(50)	19	(184)
Allocated transmission instruments		3	6	6
Settlements		32	16	27
Balance at end of period		54	69	28
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		$ (16)	$ 34	$ (139)
Level 3 | San Diego Gas and Electric Company [Member] | Minimum
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		(1.81)	(3.77)
Market electricity forward price inputs (in dollars per MWH) | $ / MWh		24.10	19.60	21.00
Level 3 | San Diego Gas and Electric Company [Member] | Minimum | Forecast
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh	(3.67)
Level 3 | San Diego Gas and Electric Company [Member] | Maximum
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		14.11	6.03
Market electricity forward price inputs (in dollars per MWH) | $ / MWh		105.00	78.10	61.15
Level 3 | San Diego Gas and Electric Company [Member] | Maximum | Forecast
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh	6.96
Level 3 | San Diego Gas and Electric Company [Member] | Median
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		(0.12)	(1.58)
Level 3 | San Diego Gas and Electric Company [Member] | Median | Forecast
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh	(0.70)
Level 3 | San Diego Gas and Electric Company [Member] | Weighted Average
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Market electricity forward price inputs (in dollars per MWH) | $ / MWh		53.57	39.71	37.92
Level 3 | Sempra Infrastructure | Other current assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 7	$ 7
Ending balance		7	$ 7
Level 3 | Sempra Infrastructure | Deferred Credits and Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance		$ 4
Ending balance			$ 4