Retirement Benefits (Reconciliation of Prior Service Credit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
U.S. Pension Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	$ 55	$ 73
Recognized as component of net periodic benefit credit	(16)	(18)
Amount at end of year	39	55
Non- U.S Pension Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	23	24
Recognized as component of net periodic benefit credit	3	(2)
Plan amendments	(3)	0
Exchange rate adjustments	0	1
Amount at end of year	23	23
U.S. Postretirement Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	26	39
Recognized as component of net periodic benefit credit	(13)	(13)
Amount at end of year	13	26
Non- U.S Postretirement Benefits [Member]
Reconciliation of unrecognized prior service credit [Roll Forward]
Amount disclosed as of prior year-end	1	1
Recognized as component of net periodic benefit credit	0	0
Plan amendments	0	0
Exchange rate adjustments	0	0
Amount at end of year	$ 1	$ 1