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Fair Value of Financial Instruments - Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets $ 175 $ 123  
Derivative liabilities 371 332  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Change in unrealized losses included in earnings for derivatives and other financial instruments held as of December 31, $ (4) $ (6) $ 28
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  
Call Option | El Segundo, Marsh Landing and Walnut Creek Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of long term debt $ 366 $ 325  
Fair value of short term debt   5  
Fair Value, Recurring      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Beginning balance (317) (336)  
Settlements (2) 28  
Total losses for the period included in earnings (33) (9)  
Ending balance (352) (317) (336)
Change in unrealized losses included in earnings for derivatives and other financial instruments held as of December 31, (33) (9)  
Level 2 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 166 123  
Derivative liabilities 0 2  
Level 3 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 19 13  
Derivative liabilities 371 330  
Energy-related commodity contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 9 2  
Derivative liabilities 371 330  
Energy-related commodity contracts | Level 2 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 0 2  
Derivative liabilities 0 0  
Energy-related commodity contracts | Level 3 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 9 0  
Derivative liabilities 371 330  
Interest rate contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 166 121  
Derivative liabilities   2  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Change in unrealized losses included in earnings for derivatives and other financial instruments held as of December 31, 29 (17) $ 100
Interest rate contracts | Level 2 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 166 121  
Derivative liabilities 0 2  
Interest rate contracts | Level 3 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 0 0  
Derivative liabilities 0 0  
Other Financial Instruments | Level 2 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 0 0  
Other Financial Instruments | Level 3 | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets $ 10 $ 13