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Supplemental Balance Sheet Data - Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Spare parts $ 180 $ 160
Intangible assets—net 15 45
Nonqualified employee benefit trusts 16 20
Tax-related assets 545 33
Other 30 27
Other assets $ 786 $ 285