Retirement Benefits (Effects of One Percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) (Foreign Pension and Postretirement Benefit Plan, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Foreign Pension and Postretirement Benefit Plan, Defined Benefit [Member]
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	9
Effect on postretirement benefit obligation 1 Percentage Point Decrease	$ (7)