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Employee Benefits - Defined Contribution Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred compensation plan      
Deferred compensation plan income (expense) $ (6) $ (11) $ 2
Deferred compensation plan liability included in other liabilities 23 45  
Deferred compensation plan assets included in other current assets 26 51  
Pension distribution 32    
Investment income (expense) related to the mark-to-market of investments treated as trading securities 6 11 (2)
United States      
Defined contribution plans      
Contribution expense $ 4 $ 4 $ 4