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Employee Benefits - Defined Contribution Plan (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Deferred compensation plan      
Number of investments, which are taken as reference to measure the interest that may be acquired | item 3    
Employer contribution as percentage of the employees' reduced compensation 3.00%    
Number of deferred compensation plans | item 2    
Deferred compensation plan expense $ 10 $ 4 $ 0
Deferred compensation plan liability included in other liabilities 40 36  
Deferred compensation plan assets included in other current assets 46 40  
Investment income related to the mark-to-market of investments treated as trading securities $ 9 $ 4 $ 0
United States      
Defined contribution plans      
Employer contribution (as a percent of employee contributions) 50.00% 50.00% 50.00%
Employer contribution limit per calendar year (as a percent of compensation) 6.00% 6.00% 6.00%
Vesting percentage after one year of service 20.00% 20.00% 20.00%
Additional vesting percentage with each additional complete year of service 20.00% 20.00% 20.00%
Contribution expense $ 3 $ 2 $ 2
Defined contribution plan covering hourly, non-union employees      
Defined contribution plans      
Contribution expense $ 1 $ 1 $ 1