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FAIR VALUE MEASUREMENTS - RECON OF LEVEL 3 ASSETS (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) $ / MWh | Dec. 31, 2023 USD ($) $ / MWh | Dec. 31, 2022 USD ($) $ / MWh | Dec. 31, 2021 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 relating to instruments still held at December 31 |  |
Other Sempra |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 23 | $ 17 | $ 7 | $ 3
Realized and unrealized gains |  | 15 | 19 | 11
Settlements |  | (9) | (9) | (7)
Ending balance |  | 23 | 17 | 7
Change in unrealized gains relating to instruments still held at December 31 |  | 13 | 18 | 11
Level 3 |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | 10 | 35 | 54 | 69
Realized and unrealized losses |  | (17) | (56) | (50)
Allocated transmission instruments |  | (1) | (4) | 3
Settlements |  | (7) | 41 | 32
Balance at end of period |  | 10 | 35 | 54
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period |  | (13) | (10) | (16)
Level 3 | SDG&E |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 10 | 35 | 54 | 69
Realized and unrealized losses |  | (17) | (56) | (50)
Allocated transmission instruments |  | (1) | (4) | 3
Settlements |  | (7) | 41 | 32
Balance at end of period |  | 10 | 35 | 54
Change in unrealized gains (losses) relating to derivative instruments still held at the end of the period |  | $ (13) | $ (10) | (16)
Level 3 | SDG&E | 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 |  |  | 33.45 |
Level 3 | SDG&E | 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 | (3.69) |  |  |
Level 3 | SDG&E | 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 |  |  | 274.70 |
Level 3 | SDG&E | 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 | 9.55 |  |  |
Level 3 | SDG&E | Median |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Congestion revenue rights (in dollars per MWH) | $ / MWh |  | (0.56) | (0.70) |
Level 3 | SDG&E | 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 | (0.44) |  |  |
Level 3 | SDG&E | 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 |
Level 3 | Other Sempra | Other Current Assets |  |  |  |
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 | Other Sempra | Other long-term assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | $ 16 | 10 |  |
Ending balance |  | $ 16 | $ 10 |

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