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Loans and asset quality- Lost Interest (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Disclosure Lost Interest [Abstract]
Amount by which interest income recognized on nonperforming loans exceeded reversals	$ 1	$ 2	$ 0
Amount by which interest income would have increased if nonperforming loans at period-end had been performing for the entire year	$ 3	$ 3	$ 5

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

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