Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Loans and leases held for sale:
Commercial and industrial loans	$ 10		$ 36
Commercial mortgage loans	1		11
Commercial construction loans	1		2
Commercial leases	1		1
Residential mortgage loans	689		1,193
Other consumer loans and leases	22		18
Total loans and leases held for sale	724	[1]	1,261	[1]
Portfolio loans and leases:
Commercial and industrial loans	42,052		40,765
Commercial mortgage loans	7,209		7,399
Commercial construction loans	2,302		2,069
Commercial leases	3,786		3,720
Total commercial loans and leases	55,349		53,953
Residential mortgage loans	12,569		12,389
Home equity	8,714		8,886
Automobile loans	11,873		12,037
Credit card	2,291		2,401
Other consumer loans and leases	448		418
Total consumer loans and leases	35,895		36,131
Portfolio loans and leases	$ 91,244	[2],[3]	$ 90,084	[2],[3]

[1] Includes $689 and $561 of residential mortgage loans held for sale measured at fair value at March 31, 2015 and December 31, 2014, respectively.

[2] Includes $176 and $179 of cash and due from banks, $48 and $47 of commercial mortgage loans, $2,900 and $3,331 of automobile loans, $(23) and $(22) of ALLL, $26 and $25 of other assets, $4 and $5 of other liabilities, and $2,983 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2015 and December 31, 2014, respectively. For further information refer to Note 10.

[3] Includes $126 and $108 of residential mortgage loans measured at fair value at March 31, 2015 and December 31, 2014, respectively.