Retirement Benefits (Reconciliation of Net Actuarial Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Total gain (loss) recognized as change in plan assets and benefit obligations	$ (779)	$ (90)	$ (417)
U.S. Pension Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(1,327)	(1,258)
Recognized as component of net periodic benefit cost	100	71
Liability experience	(352)	(269)
Asset experience	(116)	129
Total gain (loss) recognized as change in plan assets and benefit obligations	(468)	(140)
Amount at end of year	(1,695)	(1,327)
Non- U.S Pension Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(2,305)	(2,268)
Recognized as component of net periodic benefit cost	115	73
Effect of settlement	0	5	1
Liability experience	(575)	(430)
Asset experience	(261)	244
Effect of curtailment	(1)	2
Total gain (loss) recognized as change in plan assets and benefit obligations	(837)	(184)
Exchange rate adjustments	(11)	69
Amount at end of year	(3,038)	(2,305)	(2,268)
U.S. Postretirement Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(4)	9
Recognized as component of net periodic benefit cost	(4)	0
Liability experience	20	(13)
Asset experience	0	0
Total gain (loss) recognized as change in plan assets and benefit obligations	20	(13)
Amount at end of year	12	(4)
Non- U.S Postretirement Benefits [Member]
Reconciliation of unrecognized net actuarial gain loss [Roll Forward]
Amount disclosed as of prior year-end	(14)	(4)
Recognized as component of net periodic benefit cost	0	0
Effect of settlement	0	0	0
Liability experience	(5)	(10)
Asset experience	0	0
Effect of curtailment	0	0
Total gain (loss) recognized as change in plan assets and benefit obligations	(5)	(10)
Exchange rate adjustments	0	0
Amount at end of year	$ (19)	$ (14)	$ (4)