Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Loans and leases held for sale:
Commercial and industrial loans	$ 45		$ 83
Commercial mortgage loans	76		147
Commercial construction loans	17		63
Residential mortgage loans	2,802		1,901
Other consumer loans and leases	14		22
Total loans and leases held for sale	2,954		2,216
Portfolio loans and leases:
Commercial and industrial loans	30,783		27,191
Commercial mortgage loans	10,138	[1]	10,845	[1]
Commercial construction loans	1,020		2,048
Commercial leases	3,531		3,378
Total commercial loans and leases	45,472		43,462
Residential mortgage loans	10,672	[2]	8,956	[2]
Home equity	10,719	[1]	11,513	[1]
Automobile loans	11,827	[1]	10,983	[1]
Credit card	1,978		1,896
Other consumer loans and leases	350		681
Total consumer loans and leases	35,546		34,029
Portfolio loans and leases	$ 81,018		$ 77,491

[1] At December 31, 2011 and 2010, includes $30 and $52 of cash, $7 of other short-term investments, $50 and $29 of commercial mortgage loans, $223 and $241 of home equity loans, $259 and $648 of automobile loans, ($10) and ($14) of ALLL, $4 and $7 of other assets, $4 and $12 of other liabilities, $191 and $692 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 11.

[2] Includes $65 and $46 of residential mortgage loans measured at fair value at December 31, 2011 and 2010, respectively.