Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
AOCI
Derivatives, Beginning balance	$ 26	$ 11	$ 28	$ 8
Derivatives, Other comprehensive income (loss), net of tax	5	5	3	8
Derivatives, Ending balance	31	16	31	16
Defined Benefit and Pension Plans, Beginning balance	(223)	(109)	(221)	(106)
Pension and postretirement benefits	11	9	9	6
Defined Benefit and Pension Plans, Ending balance	(212)	(100)	(212)	(100)
Foreign Currency Translation, Beginning balance	41	65	19	48
Foreign currency translation, Other comprehensive income (loss), net of tax	(17)	6	5	23
Foreign Currency Translation, Ending balance	24	71	24	71
AOCI, Beginning balance	(156)	(33)	(174)	(50)
Other comprehensive income (loss), net of tax	(1)	20	17	37
AOCI, Ending balance	$ (157)	$ (13)	$ (157)	$ (13)