Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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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.

+ References+ Details

Restructuring Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 35	$ 37	$ 84	$ 84	$ 61
Restructuring reserve	74		64	67	65	75
Restructuring actions for remaining liabilities, Current	59		53
Productivity Initiatives and Legacy Programs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			84	84	70
Restructuring reserve			64	67	63	29
Employee severance [Member]
Restructuring Cost and Reserve [Line Items]
Net credits related to previously established liabilities					9
Employee severance [Member] \| Productivity Initiatives and Legacy Programs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			84	84	70
Property lease termination charges [Member] \| Productivity Initiatives and Legacy Programs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5		$ 11