Retirement Benefits (Reconciliation of Net Actuarial Loss) (Details) (Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
U.S. Pension Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	$ (1,887)	$ (1,695)
Recognized as component of net periodic benefit cost	208	152
Liability experience	541	(522)
Asset experience	164	178
Total amount recognized as change in plan assets and benefit obligations	705	(344)
Ending balance, December 31	(974)	(1,887)
Non- U.S Pension Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(3,309)	(3,038)
Recognized as component of net periodic benefit cost	108	118
Effect of settlement	0	1
Liability experience	53	(419)
Asset experience	111	138
Effect of curtailment	0	3
Total amount recognized as change in plan assets and benefit obligations	164	(278)
Exchange rate adjustments	27	(112)
Ending balance, December 31	(3,010)	(3,309)
U.S. Postretirement Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(2)	12
Recognized as component of net periodic benefit cost	0	(1)
Liability experience	15	(13)
Asset experience	0	0
Total amount recognized as change in plan assets and benefit obligations	15	(13)
Ending balance, December 31	13	(2)
Foreign Postretirement Benefit Plan, Defined Benefit [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Beginning balance	(27)	(19)
Recognized as component of net periodic benefit cost	2	1
Effect of settlement	0	0
Liability experience	8	(10)
Asset experience	0	0
Effect of curtailment	0	1
Total amount recognized as change in plan assets and benefit obligations	8	(9)
Exchange rate adjustments	1	0
Ending balance, December 31	$ (16)	$ (27)