Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Loans and leases held for sale:
Commercial and industrial loans	$ 48		$ 45		$ 87
Commercial mortgage loans	67		76		107
Commercial construction loans	15		17		40
Residential mortgage loans	1,429		2,802		1,026
Other consumer loans and leases	25		14		31
Total loans and leases held for sale	1,584		2,954		1,291
Portfolio loans and leases:
Commercial and industrial loans	32,155		30,783		27,344
Commercial mortgage loans	9,909	[1]	10,138	[1]	10,510	[1]
Commercial construction loans	901		1,020		1,980
Commercial leases	3,512		3,531		3,367
Total commercial loans and leases	46,477		45,472		43,201
Residential mortgage loans	11,094	[2]	10,672	[2]	9,530	[2]
Home equity	10,493	[1]	10,719	[1]	11,222	[1]
Automobile loans	11,832	[1]	11,827	[1]	11,129	[1]
Credit card	1,896		1,978		1,821
Other consumer loans and leases	321		350		562
Total consumer loans and leases	35,636		35,546		34,264
Portfolio loans and leases	$ 82,113		$ 81,018		$ 77,465

[1] Includes $19, $30 and $54 of cash, $4, $7 and $7of other short-term investments, $50, $50 and $29 of commercial mortgage loans, $217, $223 and $236 of home equity loans, $105, $259 and $529 of automobile loans, ($7), ($10) and ($12) of ALLL, $3, $4 and $5 of other assets, $3, $4 and $10 of other liabilities, $125, $191and $492 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2012, December 31, 2011 and March 31, 2011, respectively. See Note 8.

[2] Includes $67, $65 and $54 of residential mortgage loans measured at fair value at March 31, 2012, December 31, 2011 and March 31, 2011, respectively.