Derivatives and Hedging (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Effect on statement of operations resulting from changes in the fair values of derivatives designated as cash flow hedges
Payment for settlement of forward exchange contract		$ (78)		$ (78)
Derivatives designated as hedging instruments | Interest rate swaps | Interest expense, net of amounts capitalized
Effect on statement of operations resulting from changes in the fair values of derivatives designated as cash flow hedges
Loss associated with effective portion	(1)	(3)	(4)	(8)
Derivatives designated as hedging instruments | Interest rate swaps | Other, net
Effect on statement of operations resulting from changes in the fair values of derivatives designated as cash flow hedges
Gain associated with effective portion	4		4
Nondesignated | Interest rate swaps | Interest expense, net of amounts capitalized
Effect on statement of operations resulting from changes in the fair values of derivatives designated as cash flow hedges
Loss on the termination of not designated derivative instruments			(1)
Nondesignated | Forward exchange contract | Other, net
Effect on statement of operations resulting from changes in the fair values of derivatives designated as cash flow hedges
Loss on the termination of not designated derivative instruments		(78)		(78)
Payment for settlement of forward exchange contract		$ 78		$ 78