Retirement Benefits (Reconciliation of Prior Service Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Effect of curtailment	$ (102)	$ 3	$ 65
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Plan termination	0	0	0
U.S. Pension Benefits
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	0	(128)	0
U.S. Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Plan termination	0	(128)	0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | U.S. Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0	0
Recognized as component of net periodic benefit cost	0	0
Plan termination	0	0
Ending balance, December 31	0	0	0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | Non-U.S. Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3)	(2)
Recognized as component of net periodic benefit cost	(1)	(1)
Effect of curtailment	0	(5)
Plan amendments	49	5
Exchange rate adjustments	(2)	0
Ending balance, December 31	43	(3)	(2)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) | U.S. Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(7)	4
Recognized as component of net periodic benefit cost	4	3
Plan termination	0	(14)
Ending balance, December 31	(3)	(7)	4
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