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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Pension Plans      
Benefit obligation at beginning of year $ 4,126 $ 3,959  
Service cost 41 42 $ 38
Interest cost 129 148 187
Actuarial loss 20 501  
Currency and other 221 (304)  
Benefit payments from plans (218) (202)  
Direct benefit payments (8) (15)  
Settlements (15) (3)  
Benefit obligation at end of year 4,296 4,126 3,959
Fair value of plan assets at beginning of year 3,534 3,508  
Actual return on plan assets 333 413  
Employer contributions 53 108  
Currency and other 204 (290)  
Benefit payments (218) (202)  
Settlements (9) (3)  
Fair value of plan assets at end of year 3,897 3,534 3,508
Funded Status (399) (592)  
Other Postretirement Benefit Plans      
Benefit obligation at beginning of year 758 717  
Service cost 12 11 12
Interest cost 32 33 32
Actuarial loss 16 41  
Currency and other (3) 9  
Benefit payments from plans 0 0  
Direct benefit payments (50) (53)  
Settlements 0 0  
Benefit obligation at end of year 765 758 717
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 $ (765) $ (758)