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Employee Benefit Plans - Changes in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Change in plan assets:    
Fair value of plan assets beginning balance $ 241  
Fair value of plan assets ending balance 247 $ 241
Defined Pension  Benefits    
Change in benefit obligation:    
Accumulated benefit beginning balance 127 128
Service cost 1 1
Interest cost 6 7
Benefits paid (11) (10)
Actuarial loss (gain) (5) 1
Accumulated benefit ending balance 118 127
Change in plan assets:    
Fair value of plan assets beginning balance 236 222
Actual return on plan assets 15 23
Employer contributions 1 1
Benefits paid (11) (10)
Fair value of plan assets ending balance 241 236
Over (under) funded status as of December 31, 123 109
Other Postretirement Benefits    
Change in benefit obligation:    
Accumulated benefit beginning balance 10 12
Service cost 0 0
Interest cost 0 0
Benefits paid (1) (2)
Actuarial loss (gain) 0 0
Accumulated benefit ending balance 9 10
Change in plan assets:    
Fair value of plan assets beginning balance 5 5
Actual return on plan assets 1 1
Employer contributions 1 1
Benefits paid (1) (2)
Fair value of plan assets ending balance 6 5
Over (under) funded status as of December 31, $ (3) $ (5)