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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Principal Plans      
Projected benefit obligation (PBO) $ 3,339 $ 3,629  
Accumulated benefit obligation (ABO) 3,339 3,629  
Fair value of plan assets 3,389 3,627  
All Other Pension Plans      
Projected benefit obligation (PBO) 472 712  
Accumulated benefit obligation (ABO) 408 619  
Fair value of plan assets 355 566  
Defined Benefit Pension Plans      
Projected benefit obligation (PBO) 3,811 4,341 $ 4,047
Accumulated benefit obligation (ABO) 3,747 4,248  
Fair value of plan assets $ 3,744 $ 4,193 $ 3,803