Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Loans and leases held for sale:
Commercial and industrial loans	$ 66		$ 83		$ 200
Commercial mortgage loans	105		147		348
Commercial construction loans	26		63		151
Residential mortgage loans	1,629		1,901		2,014
Other consumer loans and leases	14		22		20
Total loans and leases held for sale	1,840		2,216		2,733
Portfolio loans and leases:
Commercial and industrial loans	29,258		27,191		26,302
Commercial mortgage loans	10,330	[1]	10,845	[1]	10,985	[1]
Commercial construction loans	1,213		2,048		2,349
Commercial leases	3,368		3,378		3,304
Total commercial loans and leases	44,169		43,462		42,940
Residential mortgage loans	10,249	[2]	8,956	[2]	7,975	[2]
Home equity	10,920	[1]	11,513	[1]	11,774	[1]
Automobile loans	11,593	[1]	10,983	[1]	10,738	[1]
Credit card	1,878		1,896		1,832
Other consumer loans and leases	407		681		750
Total consumer loans and leases	35,047		34,029		33,069
Portfolio loans and leases	$ 79,216		$ 77,491		$ 76,009

[1] Includes $35, $52, and $56 of cash, $7, $7 and $7 of other short-term investments, $29, $29 and $29 of commercial mortgage loans, $228, $241 and $248 of home equity loans, $334, $648 and $771 of automobile loans, ($10), ($14) and ($15) of ALLL, $3, $7 and $7 of other assets, $5, $12 and $17 of other liabilities and $270, $692 and $834 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2011, December 31, 2010 and September 30, 2010, respectively. See Note 9.

[2] Includes $62, $46 and $42 of residential mortgage loans measured at fair value at September 30, 2011, December 31, 2010 and September 30, 2010, respectively.