Loans and Leases Classified by Primary Purpose (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Loans and leases held for sale:
Commercial and industrial loans	$ 12		$ 39
Commercial mortgage loans	7		13
Commercial leases	3
Commercial construction loans	4		9
Residential mortgage loans	2,113		2,856
Other consumer loans and leases	9		22
Total loans and leases held for sale	2,148		2,939
Portfolio loans and leases:
Commercial and industrial loans	37,856		36,038
Commercial mortgage loans	8,443	[1]	9,103	[1]
Commercial construction loans	754		698
Commercial leases	3,567		3,549
Total commercial loans and leases	50,620		49,388
Residential mortgage loans	12,400	[2]	12,017	[2]
Home equity	9,531		10,018
Automobile loans	12,015		11,972
Credit card	2,114		2,097
Other consumer loans and leases	352		290
Total consumer loans and leases	36,412		36,394
Portfolio loans and leases	$ 87,032		$ 85,782

[1] Includes $50 and $50 of commercial mortgage loans, $(13) and $(5) of ALLL, and $1 and $3 of other assets from consolidated VIEs that are included in their respective captions above at June 30, 2013 and December 31, 2012, respectively. See Note 8.

[2] Includes $83 and $76 of residential mortgage loans measured at fair value at June 30, 2013 and December 31, 2012, respectively.