Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Loans and leases held for sale:
Commercial and industrial loans	$ 7		$ 39
Commercial mortgage loans	6		13
Commercial construction loans	4		9
Residential mortgage loans	1,298		2,856
Other consumer loans and leases	15		22
Total loans and leases held for sale	1,330	[1]	2,939	[1]
Portfolio loans and leases:
Commercial and industrial loans	38,253		36,038
Commercial mortgage loans	8,052	[2]	9,103	[2]
Commercial construction loans	875		698
Commercial leases	3,572		3,549
Total commercial loans and leases	50,752		49,388
Residential mortgage loans	12,534	[3]	12,017	[3]
Home equity	9,356		10,018
Automobile loans	12,072	[2]	11,972	[2]
Credit card	2,157		2,097
Other consumer loans and leases	360		290
Total consumer loans and leases	36,479		36,394
Portfolio loans and leases	$ 87,231		$ 85,782

[1] Includes $1,298 and $2,856 of residential mortgage loans held for sale measured at fair value at September 30, 2013 and December 31, 2012, respectively.

[2] Includes $53 and $0 of cash and due from banks, $50 and $50 of commercial mortgage loans, $1,145 and $0 of automobile loans, $(16) and $(5) of ALLL, $12 and $3 of other assets, $2 and $0 of other liabilities, and $1,198 and $0 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2013 and December 31, 2012, respectively. See Note 9.

[3] Includes $89 and $76 of residential mortgage loans measured at fair value at September 30, 2013 and December 31, 2012, respectively.