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Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of the period	$ 17	$ 24
Recoveries	(12)	(16)
Provisions	3	9
Balance, end of the period	$ 8	$ 17

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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