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Retirement Plans (Schedule of Change in Benefit Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning projected benefit obligations $ 529 $ 570  
Service cost 33 36 $ 26
Interest cost 11 10 13
Foreign exchange impact (18) (43)  
Employee contributions 6 6  
Acquisition 7 0  
Benefits paid (20) (29)  
Ending projected benefit obligations 588 529 $ 570
Actuarial losses (gains) 40 (21)  
Actuarial losses (gains) 40 (21)  
Ending accumulated benefit obligations $ 560 $ 505