FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / MWh	Dec. 31, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($) $ / MWh	Dec. 31, 2020 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Cost of electric fuel and purchased power
Fair value, net derivative asset, liability, recurring basis, still held, unrealized gain loss, statement of income, extensible list, not disclosed, flag				Change in unrealized (losses) gains relating to instruments still held at December 31
Sempra Infrastructure
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 17	$ 7	$ 3	$ 0
Realized and unrealized gains		19	11	6
Settlements		(9)	(7)	(3)
Ending balance		17	7	3
Change in unrealized gains (losses) relating to instruments still held at the end of the period		18	11	3
Level 3 | San Diego Gas and Electric Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period	$ 35	54	69	28
Realized and unrealized (losses) gains		(56)	(50)	19
Allocated transmission instruments		(4)	3	6
Settlements		41	32	16
Balance at end of period		35	54	69
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period		$ (10)	$ (16)	34
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		(3.67)	(1.81)
Market electricity forward price inputs (in dollars per MWH) | $ / MWh		33.45	24.10
Level 3 | San Diego Gas and Electric Company | 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	(3.09)
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		6.96	14.11
Market electricity forward price inputs (in dollars per MWH) | $ / MWh		274.70	105.00
Level 3 | San Diego Gas and Electric Company | 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	10.71
Level 3 | San Diego Gas and Electric Company | Median
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Congestion revenue rights (in dollars per MWH) | $ / MWh		(0.70)	(0.12)
Level 3 | San Diego Gas and Electric Company | 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	(0.56)
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]
Market electricity forward price inputs (in dollars per MWH) | $ / MWh		85.64	53.57
Level 3 | Sempra Infrastructure | Other Current Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 7	$ 7	$ 7
Ending balance		7	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	$ 10	4	4
Ending balance		$ 10	$ 4	$ 4