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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Pension Plans      
Benefit obligation at beginning of year $ 3,811 $ 4,341  
Service cost 16 21 $ 22
Interest cost 89 80 95
Actuarial (gain) loss(a) (1,000) (105)  
Currency and other (197) (54)  
Benefit payments from plans (173) (138)  
Direct benefit payments (8) (8)  
Settlements and curtailments (97) (326)  
Benefit obligation at end of year 2,441 3,811 4,341
Fair value of plan assets at beginning of year 3,744 4,193  
Actual return on plan assets (987) 52  
Employer contributions 30 10  
Currency and other (199) (45)  
Benefit payments (173) (138)  
Settlements (94) (328)  
Fair value of plan assets at end of year 2,321 3,744 4,193
Funded Status (120) (67)  
Other Postretirement Benefit Plans      
Benefit obligation at beginning of year 669 709  
Service cost 7 8 8
Interest cost 21 19 23
Actuarial (gain) loss(a) (113) (8)  
Currency and other 2 (3)  
Benefit payments from plans 0 0  
Direct benefit payments (53) (54)  
Settlements and curtailments 0 (2)  
Benefit obligation at end of year 533 669 709
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 $ (533) $ (669)