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Asset Quality - Concession Types for our Commercial Accruing and Nonaccruing TDRs (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total commercial and consumer TDRs	$ 349	$ 320	$ 323
Total loans	53,597	52,822	51,419
Commercial Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Interest rate reduction	104	104	145
Forgiveness of principal	5	7	7
Other modification of loan terms	26	7	14
Total	135	118	166
Total loans	37,469	36,880	35,535
Consumer Loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Interest rate reduction	110	122	92
Forgiveness of principal	5	6	7
Other modification of loan terms	99	74	58
Total	214	202	157
Total loans	$ 16,128	$ 15,942	$ 15,884

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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