Loans and Leases Classified by Primary Purpose (Detail) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Loans held for sale:
Loans held for sale	[1]	$ 803	$ 903
Portfolio loans and leases:
Commercial and industrial loans		43,433	42,131
Commercial mortgage loans		6,864	6,957
Commercial construction loans		3,428	3,214
Commercial leases		3,956	3,854
Total commercial loans and leases		57,681	56,156
Residential mortgage loans		13,895	13,716
Home equity		8,112	8,301
Automobile loans		11,128	11,493
Credit card		2,138	2,259
Other consumer loans and leases		651	657
Total consumer loans and leases		35,924	36,426
Portfolio loans and leases	[2],[3]	93,605	92,582
Commercial Portfolio Segment | Commercial and industrial loans
Loans held for sale:
Loans held for sale		8	20
Commercial Portfolio Segment | Commercial mortgage loans
Loans held for sale:
Loans held for sale		10	34
Residential Mortgage Loans | Residential mortgage loans
Loans held for sale:
Loans held for sale		668	708
Consumer Portfolio Segment | Home equity
Loans held for sale:
Loans held for sale		19	35
Consumer Portfolio Segment | Automobile Loans
Loans held for sale:
Loans held for sale		1	4
Consumer Portfolio Segment | Credit Card
Loans held for sale:
Loans held for sale		$ 97	101
Consumer Portfolio Segment | Other consumer loans and leases
Loans held for sale:
Loans held for sale			$ 1

[1] Includes $600 and $519 of residential mortgage loans held for sale measured at fair value at March 31, 2016 and December 31, 2015, respectively.

[2] Includes $147 and $152 of cash and due from banks, $2,178 and $2,537 of portfolio loans and leases, $(27) and $(28) of ALLL, $11 and $14 of other assets, $4 and $3 of other liabilities, and $2,102 and $2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2016 and December 31, 2015, respectively. For further information refer to Note 9.

[3] Includes $160 and $167 of residential mortgage loans measured at fair value at March 31, 2016 and December 31, 2015, respectively.