Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Loans and leases held for sale:
Commercial and industrial loans	$ 36		$ 31
Commercial mortgage loans	11		3
Commercial construction loans	2		2
Commercial leases	1		1
Residential mortgage loans	1,193		890
Other consumer loans and leases	18		17
Total loans and leases held for sale	1,261	[1]	944	[1]
Portfolio loans and leases:
Commercial and industrial loans	40,765		39,316
Commercial mortgage loans	7,399	[2]	8,066	[2]
Commercial construction loans	2,069		1,039
Commercial leases	3,720		3,625
Total commercial loans and leases	53,953		52,046
Residential mortgage loans	12,389	[3]	12,680	[3]
Home equity	8,886		9,246
Automobile loans	12,037	[2]	11,984	[2]
Credit card	2,401		2,294
Other consumer loans and leases	418		364
Total consumer loans and leases	36,131		36,568
Portfolio loans and leases	$ 90,084		$ 88,614

[1] Includes $561 and $890 of residential mortgage loans held for sale measured at fair value at December 31, 2014, and 2013, respectively.

[2] At December 31, 2014 and 2013, includes $179 and $49 of cash and due from banks, $47 and $48 of commercial mortgage loans, $3,331 and $1,010 of automobile loans, $(22) and $(15) of ALLL, $25 and $13 of other assets, $5 and $1 of other liabilities, $3,434 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions. For further information, refer to Note 10.

[3] Includes $108 and $92 of residential mortgage loans measured at fair value at December 31, 2014 and 2013, respectively.