Supplemental Financial Information (Details 9) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Accrued Rebate Activity
Beginning balance			$ 270	$ 162
Charged as a reduction of revenue			498	381
Reversal of unclaimed rebates			(11)	(3)
Payments	(184)	(145)	(417)	(227)
Ending balance	340	313	340	313
Warranty Reserve Activity
Beginning balance			13	10
Charged to costs and expenses	2	4	8	1
Payments			(7)	(3)
Ending balance	14	8	14	8
Restructuring Activity
Beginning balance			0
Charged to expense			17
Reversal of restructuring costs			0
Payments and other			(2)
Ending balance	$ 15		$ 15

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Payments and other reductions to the restructuring reserve.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

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Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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