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Employee Benefit Plans - Schedule of Changes in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in plan assets:      
Fair value of plan assets as of January 1, $ 89    
Fair value of plan assets as of December 31, 101 $ 89  
Defined Pension Benefits      
Change in benefit obligation:      
Accumulated benefit obligation as of January 1, 180 185  
Service cost 2 2 $ 1
Interest cost 7 7 8
Benefits paid (18) (14)  
Net actuarial loss (gain) 7 0  
Accumulated benefit obligation as of December 31, 178 180 185
Change in plan assets:      
Fair value of plan assets as of January 1, 226 222  
Actual return on plan assets 37 17  
Employer contributions 1 1  
Benefits paid (18) (14)  
Fair value of plan assets as of December 31, 246 226 222
Over (under) funded status as of December 31, 68 46  
Other Postretirement Benefits      
Change in benefit obligation:      
Accumulated benefit obligation as of January 1, 39 45  
Service cost 0 0 0
Interest cost 2 2 2
Benefits paid (3) (3)  
Net actuarial loss (gain) (3) (5)  
Accumulated benefit obligation as of December 31, 35 39 45
Change in plan assets:      
Fair value of plan assets as of January 1, 6 5  
Actual return on plan assets 1 1  
Employer contributions 2 3  
Benefits paid (3) (3)  
Fair value of plan assets as of December 31, 6 6 $ 5
Over (under) funded status as of December 31, $ (29) $ (33)