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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Principal Plans      
Projected benefit obligation (PBO) $ 2,089 $ 3,339  
Accumulated benefit obligation (ABO) 2,089 3,339  
Fair value of plan assets 2,018 3,389  
All Other Pension Plans      
Projected benefit obligation (PBO) 352 472  
Accumulated benefit obligation (ABO) 305 408  
Fair value of plan assets 303 355  
Defined Benefit Pension Plans      
Projected benefit obligation (PBO) 2,441 3,811 $ 4,341
Accumulated benefit obligation (ABO) 2,394 3,747  
Fair value of plan assets $ 2,321 $ 3,744 $ 4,193