Loans & Leases (Loans and Leases Classified by Primary Purpose) (Detail) - USD ($)		Jun. 30, 2016	Dec. 31, 2015
Loans held for sale:
Loans held for sale	[1]	$ 877,000,000	$ 903,000,000
Portfolio loans and leases:
Commercial and industrial loans		43,558,000,000	42,131,000,000
Commercial mortgage loans		6,875,000,000	6,957,000,000
Commercial construction loans		3,706,000,000	3,214,000,000
Commercial leases		3,978,000,000	3,854,000,000
Total commercial loans and leases		58,117,000,000	56,156,000,000
Residential mortgage loans		14,307,000,000	13,716,000,000
Home equity		7,988,000,000	8,301,000,000
Automobile loans		10,671,000,000	11,493,000,000
Credit card		2,172,000,000	2,259,000,000
Other consumer loans and leases		654,000,000	657,000,000
Total consumer loans and leases		35,792,000,000	36,426,000,000
Portfolio loans and leases	[2],[3]	93,909,000,000	92,582,000,000
Commercial Portfolio Segment | Commercial and industrial loans
Loans held for sale:
Loans held for sale		17,000,000	20,000,000
Commercial Portfolio Segment | Commercial mortgage loans
Loans held for sale:
Loans held for sale		8,000,000	34,000,000
Residential Mortgage Loans | Residential mortgage loans
Loans held for sale:
Loans held for sale		$ 852,000,000	708,000,000
Consumer Portfolio Segment | Home equity
Loans held for sale:
Loans held for sale			35,000,000
Consumer Portfolio Segment | Automobile Loans
Loans held for sale:
Loans held for sale			4,000,000
Consumer Portfolio Segment | Credit Card
Loans held for sale:
Loans held for sale			101,000,000
Consumer Portfolio Segment | Other consumer loans and leases
Loans held for sale:
Loans held for sale			$ 1,000,000

[1] Includes $ 852 and $ 519 of residential mortgage loans held for sale measured at fair value at June 30, 2016 and December 31, 2015 , respectively.

[2] Includes $ 128 and $ 152 of cash and due from banks, $ 1,853 and $ 2,537 of portfolio loans and leases , $ (28) and $ (28) of ALLL, $ 11 and $ 14 of other assets, $ 3 and $ 3 of other liabilities , and $ 1,744 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2016 and December 31, 2015 , respectively. For further information refer to Note 9 .

[3] Includes $ 154 and $ 167 of residential mortgage loans measured at fair value at June 30, 2016 and December 31, 2015 , respectively.