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Employee Benefit Plans - Projected Benefit Obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans    
Projected benefit obligations in excess of plan assets    
Projected benefit obligation $ 407 $ 385
Fair value of plan assets 162 131
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 386 385
Accumulated benefit obligation 383 375
Fair value of plan assets 142 $ 131
2020 expected employer contributions:    
To plan trusts 43  
Expected benefit payments:    
2020 54  
2021 43  
2022 44  
2023 47  
2024 48  
2025-2029 241  
Other Postretirement Benefit Plans    
2020 expected employer contributions:    
To plan trusts 0  
Expected benefit payments:    
2020 0  
2021 0  
2022 0  
2023 0  
2024 0  
2025-2029 $ 1