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Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts $ 786 $ 745
Derivative Assets 187 308
Derivative Liability 451 180
Marketable securities held in trusts 786 745
Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 721 682
Derivative Assets 0 0
Derivative Liability 0 0
Level 2 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 65 63
Derivative Assets 187 308
Derivative Liability 451 180
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 Liability $ 0 $ 0