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Other Assets - Schedule of Other Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Capitalized repair and maintenance costs $ 148 $ 178
Pension assets 59 174
Deferred income taxes 40 46
Miscellaneous 45 39
Total other assets $ 292 $ 437