FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($) $ / MWh	Mar. 31, 2021 USD ($) $ / MWh
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 54	$ 69
Realized and unrealized gains (losses)	7	(2)
Settlements	(3)	(5)
Ending balance	58	62
Change in unrealized gains (losses) relating to instruments still held at March 31	9	(1)
Sempra Infrastructure
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	7	3
Realized and unrealized gains	8	2
Settlements	(3)	(2)
Ending balance	12	3
Change in unrealized gains (losses) relating to instruments still held at the end of the period	7	2
Sempra Infrastructure \| Other current assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	7
Sempra Infrastructure \| Other long-term assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending balance	5
San Diego Gas and Electric Company
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	54	69
Realized and unrealized gains (losses)	7	(2)
Settlements	(3)	(5)
Ending balance	58	62
Change in unrealized gains (losses) relating to instruments still held at March 31	$ 9	$ (1)
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	26.55	20.60
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	137.80	117.00
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	(0.70)	(0.12)
Market electricity forward price inputs ( in dollars per MWH) \| $ / MWh	62.79	46.46

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