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Retirement Plans (Change in Plan Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning fair value of plan assets $ 370 $ 308
Actual return (2) 21
Employer contributions 22 23
Employee contributions 6 6
Foreign exchange impact (6) 26
Acquisition 0 0
Benefits paid (14) (14)
Ending fair value of plan assets $ 376 $ 370