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Income taxes - Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Currently payable (receivable)	$ (255)	$ (229)
Deferred	43,883	37,105
Other income tax liabilities	866	928
Income taxes, principally deferred	$ 44,494	$ 37,804

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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