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Retirement Benefits (Effects of One Percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) - Foreign Pension and Postretirement Benefit Plan, Defined Benefit
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost components 1 Percentage Point Increase $ 1
Effect on total of service and interest cost components 1 Percentage Point Decrease (1)
Effect on postretirement benefit obligation 1 Percentage Point Increase 7
Effect on postretirement benefit obligation 1 Percentage Point Decrease $ (6)