v3.26.3
Fair Value of Financial Instruments - Schedule of Fair Value, Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets $ 414   $ 414   $ 156
Derivative Liabilities 72   72   360
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Beginning balance (58) $ (345) (313) $ (352)  
Settlements (2) 44 9 84  
Transfers out of Level 3 0 0 211 0  
Total gains (losses) for the period included in earnings $ 6 $ (16) $ 39 $ (49)  
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 $ (54) $ (317) $ (54) $ (317)  
Change in unrealized gains included in earnings for derivatives and other financial instruments held as of September 30, 2026 6 39  
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 69   69   330
Fair value of short term debt 3   3   3
Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 400   400   143
Derivative Liabilities 0   0   27
Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 18   18   20
Derivative Liabilities 72   72   333
Energy-related commodity contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 14   14   14
Derivative Liabilities 72   72   333
Energy-related commodity contracts | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 0   0   1
Derivative Liabilities 0   0   0
Energy-related commodity contracts | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 14   14   13
Derivative Liabilities 72   72   333
Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 400   400   142
Derivative Liabilities         27
Interest rate contracts | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 400   400   142
Derivative Liabilities 0   0   27
Interest rate contracts | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 0   0   0
Derivative Liabilities 0   0   0
Other Financial Instruments | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets 0   0   0
Other Financial Instruments | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative Assets $ 4   $ 4   $ 7