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Supplemental Balance Sheet Data - Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Spare parts $ 200 $ 180
Nonqualified employee benefit trusts 17 16
Tax-related assets 610 545
Other 40 30
Other assets $ 867 $ 771