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Employee Postretirement Benefits (Summarized Financial Information about Postretirement plans, Excluding Defined Contribution Retirement Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Pension Plans      
Benefit obligation at beginning of year $ 2,469 $ 2,441  
Service cost 12 13 $ 16
Interest cost 115 121 89
Actuarial (gain) loss(a) [1] (129) 59  
Currency and other (42) 51  
Benefit payments from plans (175) (141)  
Direct benefit payments (9) (9)  
Settlements and curtailments (5) (66)  
Benefit obligation at end of year 2,236 2,469 2,441
Fair value of plan assets at beginning of year 2,329 2,321  
Actual return on plan assets (29) 137  
Employer contributions 15 26  
Currency and other (43) 52  
Benefit payments (175) (141)  
Settlements (4) (66)  
Fair value of plan assets at end of year 2,093 2,329 2,321
Funded Status (143) (140)  
Other Postretirement Benefit Plans      
Benefit obligation at beginning of year 531 533  
Service cost 4 4 7
Interest cost 28 30 21
Actuarial (gain) loss(a) [1] (3) 13  
Currency and other (12) 5  
Benefit payments from plans 0 0  
Direct benefit payments (51) (54)  
Settlements and curtailments 0 0  
Benefit obligation at end of year 497 531 533
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 0 0  
Currency and other 0 0  
Benefit payments 0 0  
Settlements 0 0  
Fair value of plan assets at end of year 0 0 $ 0
Funded Status $ (497) $ (531)  
[1] The actuarial net gains in 2024 and actuarial net losses in 2023 were primarily due to discount rate increases and decreases, respectively.