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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Principal Plans      
Projected benefit obligation (“PBO”) $ 1,900 $ 2,123  
Accumulated benefit obligation (“ABO”) 1,900 2,123  
Fair value of plan assets 1,795 2,019  
All Other Pension Plans      
Projected benefit obligation (“PBO”) 336 346  
Accumulated benefit obligation (“ABO”) 289 298  
Fair value of plan assets 298 310  
Defined Benefit Pension Plans      
Projected benefit obligation (“PBO”) 2,236 2,469 $ 2,441
Accumulated benefit obligation (“ABO”) 2,189 2,421  
Fair value of plan assets $ 2,093 $ 2,329 $ 2,321