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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Pension Plans      
Benefit obligation at beginning of year $ 4,341 $ 4,047  
Service cost 21 22 $ 21
Interest cost 80 95 121
Actuarial (gain) loss(a) (105) 333  
Currency and other (54) 134  
Benefit payments from plans (138) (169)  
Direct benefit payments (8) (8)  
Settlements and curtailments (326) (113)  
Benefit obligation at end of year 3,811 4,341 4,047
Fair value of plan assets at beginning of year 4,193 3,803  
Actual return on plan assets 52 489  
Employer contributions 10 40  
Currency and other (45) 120  
Benefit payments (138) (169)  
Settlements (328) (90)  
Fair value of plan assets at end of year 3,744 4,193 3,803
Funded Status (67) (148)  
Other Postretirement Benefit Plans      
Benefit obligation at beginning of year 709 693  
Service cost 8 8 8
Interest cost 19 23 28
Actuarial (gain) loss(a) (8) 42  
Currency and other (3) (10)  
Benefit payments from plans 0 0  
Direct benefit payments (54) (47)  
Settlements and curtailments (2) 0  
Benefit obligation at end of year 669 709 693
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 $ (669) $ (709)