Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Loans and leases held for sale:
Commercial and industrial loans	$ 13		$ 45		$ 56
Commercial mortgage loans	35		76		98
Commercial leases	4
Commercial construction loans	12		17		27
Residential mortgage loans	1,789		2,802		989
Other consumer loans and leases	10		14		15
Total loans and leases held for sale	1,863		2,954		1,185
Portfolio loans and leases:
Commercial and industrial loans	32,612		30,783		28,099
Commercial mortgage loans	9,662	[1]	10,138	[1]	10,233	[1]
Commercial construction loans	822		1,020		1,778
Commercial leases	3,467		3,531		3,326
Total commercial loans and leases	46,563		45,472		43,436
Residential mortgage loans	11,429	[2]	10,672	[2]	9,849	[2]
Home equity	10,377	[1]	10,719	[1]	11,048	[1]
Automobile loans	11,739	[1]	11,827	[1]	11,315	[1]
Credit card	1,943		1,978		1,856
Other consumer loans and leases	308		350		463
Total consumer loans and leases	35,796		35,546		34,531
Portfolio loans and leases	$ 82,359		$ 81,018		$ 77,967

[1] Includes $9, $30 and $42 of cash, $4, $7 and $7of other short-term investments, $51, $50 and $29 of commercial mortgage loans, $0, $223 and $231 of home equity loans, $75, $259 and $424 of automobile loans, ($3), ($10) and ($11) of ALLL, $3, $4 and $4 of other assets, $2, $4 and $8 of other liabilities, $73, $191and $365 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2012, December 31, 2011 and June 30, 2011, respectively. See Note 8.

[2] Includes $76, $65 and $59 of residential mortgage loans measured at fair value at June 30, 2012, December 31, 2011 and June 30, 2011, respectively.