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Asset Quality - Concession Types for our Commercial Accruing and Nonaccruing TDRs (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total commercial and consumer TDRs	$ 311	$ 320	$ 274
Total loans	53,101	52,822	49,605
Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Interest rate reduction	88	104	155
Forgiveness of principal	6	7	13
Other modification of loan terms	8	7	20
Total	102	118	188
Consumer Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Interest rate reduction	104	122	81
Forgiveness of principal	5	6	5
Other modification of loan terms	100	74
Total	$ 209	$ 202	$ 86

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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