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Employee Benefit Plans - Changes in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in plan assets:    
Fair value of plan assets as of January 1, $ 260  
Fair value of plan assets as of December 31, 280 $ 260
Defined Pension  Benefits    
Change in benefit obligation:    
Accumulated benefit obligation as of January 1, 165 157
Service cost 1 1
Interest cost 5 6
Benefits paid (11) (13)
Actuarial loss (gain) 18 14
Accumulated benefit obligation as of December 31, 178 165
Change in plan assets:    
Fair value of plan assets as of January 1, 254 218
Actual return on plan assets 30 48
Employer contributions 1 1
Benefits paid (11) (13)
Fair value of plan assets as of December 31, 274 254
Over (under) funded status as of December 31, 96 89
Other Postretirement Benefits    
Change in benefit obligation:    
Accumulated benefit obligation as of January 1, 27 29
Service cost 0 0
Interest cost 1 1
Benefits paid (2) (2)
Actuarial loss (gain) (5) (1)
Accumulated benefit obligation as of December 31, 21 27
Change in plan assets:    
Fair value of plan assets as of January 1, 6 6
Actual return on plan assets 1 1
Employer contributions 1 1
Benefits paid (2) (2)
Fair value of plan assets as of December 31, 6 6
Over (under) funded status as of December 31, $ (15) $ (21)