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Employee Benefit Plans - Changes in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in plan assets:    
Fair value of plan assets as of January 1, $ 224  
Fair value of plan assets as of December 31, 260 $ 224
Defined Pension Benefits    
Change in benefit obligation:    
Accumulated benefit obligation as of January 1, 157 178
Service cost 1 1
Interest cost 6 6
Benefits paid (13) (15)
Net actuarial loss (gain) 14 (13)
Accumulated benefit obligation as of December 31, 165 157
Change in plan assets:    
Fair value of plan assets as of January 1, 218 246
Actual return on plan assets 48 (14)
Employer contributions 1 1
Benefits paid (13) (15)
Fair value of plan assets as of December 31, 254 218
Over (under) funded status as of December 31, 89 61
Other Postretirement Benefits    
Change in benefit obligation:    
Accumulated benefit obligation as of January 1, 29 35
Service cost 0 0
Interest cost 1 1
Benefits paid (2) (2)
Net actuarial loss (gain) (1) (5)
Accumulated benefit obligation as of December 31, 27 29
Change in plan assets:    
Fair value of plan assets as of January 1, 6 6
Actual return on plan assets 1 0
Employer contributions 1 2
Benefits paid (2) (2)
Fair value of plan assets as of December 31, 6 6
Over (under) funded status as of December 31, $ (21) $ (23)