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Other Assets - Schedule of Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Capitalized repair and maintenance costs $ 198 $ 148
Pension assets 79 59
Deferred income taxes 95 40
Miscellaneous 33 45
Total other assets $ 405 $ 292