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Supplemental Balance Sheet Data - Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Spare parts $ 228 $ 208
Nonqualified employee benefit trusts 18 17
Tax-related assets 654 638
Other 80 54
Other assets $ 980 $ 917