Supplemental Financial Information (Details 8) (USD $) In Millions, unless otherwise specified	1 Months Ended				3 Months Ended		9 Months Ended
	Aug. 31, 2012	Jul. 31, 2012	Aug. 31, 2011	Jul. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accrued Rebate Activity
Beginning balance							$ 317	$ 270
Charged as a reduction to revenue					216	184	512	498
Reversal of unclaimed rebates							(8)	(11)
Payments							(441)	(417)
Ending balance					380	340	380	340
Warranty Reserve Activity
Beginning balance							14	13
Charged to costs and expenses	2	2	2	2	2	2	4	8
Payments							(4)	(7)
Ending balance					14	14	14	14
Restructuring Activity
Beginning balance							8
Charged to expense					2	17	6	17
Cash Payments							(10)
Ending balance					$ 4		$ 4