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Retirement Plans (Change in Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning fair value of plan assets $ 289 $ 310
Actual return 20 2
Employer contributions 18 16
Employee contributions 6 6
Foreign exchange impact (9) (18)
Acquisition 2 0
Benefits paid (18) (27)
Ending fair value of plan assets $ 308 $ 289