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Retirement Benefits (Effects of One Percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) - Foreign Plan - Pension and Postretirement Benefit Plan
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost components 1 Percentage Point Increase $ 0
Effect on total of service and interest cost components 1 Percentage Point Decrease 0
Effect on postretirement benefit obligation 1 Percentage Point Increase 7
Effect on postretirement benefit obligation 1 Percentage Point Decrease $ (6)