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Loans and leases and the allowance for credit losses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Contractual principal and interest payments	$ 425	$ 447
Purchased impaired loans as a percentage of total assets	Less than 1% of the Company's assets	Less than 1% of the Company's assets
Loan delinquent period	90 days
Maturity period of line of credit	More than 150 days

The price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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