Retirement Benefits (Reconciliation of Prior Service Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Effect of curtailment	$ 3	$ 65
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Plan termination	0	0	$ 0
Other Postretirement Benefit Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Plan termination	(128)	0
U.S. Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Plan termination	(128)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | U.S. Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0	7
Recognized as component of net periodic benefit cost	0	(7)
Plan termination	0	0
Plan amendments	0	0
Ending balance, December 31	0	0	7
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | Non-U.S. Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2)	85
Recognized as component of net periodic benefit cost	(1)	(9)
Effect of curtailment	(5)	(65)
Plan amendments	5	(13)
Exchange rate adjustments	0	0
Ending balance, December 31	(3)	(2)	85
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | U.S. Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	4	0
Recognized as component of net periodic benefit cost	3	0
Plan termination	(14)	0
Plan amendments	0	4
Ending balance, December 31	(7)	4	0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | Non-U.S. Postretirement Benefits
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	$ 0