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Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill      
Gross Carrying Amount $ 289 $ 289  
Net Carrying Amount 289 289  
Amortizable intangibles:      
Gross Carrying Amount 95 216  
Accumulated Amortization (74) (190)  
Net Carrying Amount 21 26  
Amortization of intangible assets 5 5 $ 16
Customer contracts      
Amortizable intangibles:      
Gross Carrying Amount 90 210  
Accumulated Amortization (71) (187)  
Net Carrying Amount $ 19 23  
Weighted Average Amortization Period 10 years    
Finite-Lived Intangible Assets, Period Increase (Decrease) $ 120    
Developed technology      
Amortizable intangibles:      
Gross Carrying Amount 5 6  
Accumulated Amortization (3) (3)  
Net Carrying Amount $ 2 $ 3  
Weighted Average Amortization Period 5 years    
Finite-Lived Intangible Assets, Period Increase (Decrease) $ 1