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Fair Value Measurements (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts $ 713 $ 786
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 713 786
Derivative assets 362 187
Derivative liabilities 342 451
Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 641 721
Derivative assets 0 0
Derivative liabilities 0 0
Level 2 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 72 65
Derivative assets 362 187
Derivative liabilities 342 451
Level 3 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 0 0
Derivative assets 0 0
Derivative liabilities $ 0 $ 0