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Employee Benefit Plans - Projected Benefit Obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans    
Projected benefit obligations in excess of plan assets    
Projected benefit obligation $ 386 $ 449
Fair value of plan assets 170 177
Accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 384 449
Accumulated benefit obligation 383 445
Fair value of plan assets 168 $ 177
2022 expected employer contributions:    
To plan trusts 11  
Expected benefit payments:    
2022 41  
2023 42  
2024 43  
2025 44  
2026 45  
2027 - 2031 238  
Other Postretirement Benefit Plans    
2022 expected employer contributions:    
To plan trusts 0  
Expected benefit payments:    
2022 0  
2023 0  
2024 0  
2025 0  
2026 0  
2027 - 2031 $ 1