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Supplemental Balance Sheet Data - Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Spare parts $ 208 $ 200
Nonqualified employee benefit trusts 17 17
Tax-related assets 638 610
Other 54 40
Other assets $ 917 $ 867