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Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Derivative [Line Items]    
Derivative assets $ 175 $ 123
Derivative liabilities 371 332
Derivatives Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 27 19
Derivative liabilities 0 2
Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 148 104
Derivative liabilities 371 330
Interest rate contracts current | Derivatives Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 5 7
Derivative liabilities 0 0
Interest rate contracts current | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 30 33
Derivative liabilities 0 0
Interest rate contracts long-term | Derivatives Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 22 12
Derivative liabilities 0 2
Interest rate contracts long-term | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 109 69
Derivative liabilities 0 0
Energy-related commodity contracts current | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 4 1
Derivative liabilities 56 51
Energy-related commodity contracts long-term | Derivatives Not Designated as Cash Flow Hedges:    
Derivative [Line Items]    
Derivative assets 5 1
Derivative liabilities $ 315 $ 279