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Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts $ 745 $ 774
Derivative Assets 308 84
Derivative Liability 180 386
Marketable securities held in trusts 745 774
Level 1 | Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 682 713
Derivative Assets 0 0
Derivative Liability 0 0
Level 2 | Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in trusts 63 61
Derivative Assets 308 84
Derivative Liability 180 386
Level 3 | Fair Value [Member]    
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