v3.26.1
Fair Value of Financial Instruments - Schedule of Fair Value, Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets $ 193   $ 193   $ 156
Derivative Liabilities 93   93   360
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Beginning balance (168) $ (363) (313) $ (352)  
Settlements 8 33 11 40  
Total gains (losses) for the period included in earnings $ 6 $ (15) $ 33 $ (33)  
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative instruments Derivative instruments Derivative instruments Derivative instruments  
Ending balance $ (58) $ (345) $ (58) $ (345)  
Change in unrealized gains included in earnings for derivatives and other financial instruments held as of June 30, 2026 6 33  
El Segundo, Marsh Landing and Walnut Creek Notes | Call Option          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of long term debt 80   80   330
Fair value of short term debt 2   2   3
Energy-related commodity contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 20   20   14
Derivative Liabilities 82   82   333
Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 173   173   142
Derivative Liabilities 11   11   27
Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 173   173   143
Derivative Liabilities 11   11   27
Level 2 | Energy-related commodity contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 0   0   1
Derivative Liabilities 0   0   0
Level 2 | Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 173   173   142
Derivative Liabilities 11   11   27
Level 2 | Other financial instruments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 0   0   0
Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 24   24   20
Derivative Liabilities 82   82   333
Level 3 | Fair Value, Recurring          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Transfers out of Level 3 96 $ 0 211 $ 0  
Level 3 | Energy-related commodity contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 20   20   13
Derivative Liabilities 82   82   333
Level 3 | Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 0   0   0
Derivative Liabilities 0   0   0
Level 3 | Other financial instruments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets $ 4   $ 4   $ 7