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Accrued Expenses and Allowance for Doubtful Accounts - Summary of Allowance of Doubtful Accounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finance Receivable Transferred To Held For Sale [Line Items]
Balance at Beginning of Year	$ 4,106	$ 3,939	$ 4,860
Provision for doubtful accounts	3,770	2,824	2,648
Accounts Written off, Net of Recoveries	(3,030)	(2,657)	(3,569)
Balance at End of Year	$ 4,846	$ 4,106	$ 3,939

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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