Retirement Benefits (Reconciliation of Prior Service Credit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Effect of curtailment	$ 65
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | U.S. Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	7	23
Recognized as component of net periodic benefit cost	(7)	(16)
Plan amendments	0	0
Ending balance, December 31	0	7
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Non- U.S Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	85	93
Recognized as component of net periodic benefit cost	(9)	(6)
Effect of curtailment	(65)	0
Plan amendments	(13)	0
Exchange rate adjustments	0	(2)
Ending balance, December 31	(2)	85
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | U.S. Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0	0
Recognized as component of net periodic benefit cost	0	0
Plan amendments	4	0
Ending balance, December 31	4	0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Foreign Postretirement Benefit Plan, Defined Benefit [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0	0
Recognized as component of net periodic benefit cost	0	0
Effect of curtailment	0	0
Plan amendments	0	0
Exchange rate adjustments	0	0
Ending balance, December 31	$ 0	$ 0