Credit Quality (Summary of the Bancorp's Nonperforming Loans and Leases by Class) (Parenthetical) (Detail) - USD ($)		Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications
Loans held for sale	[1]	$ 492,000,000	$ 751,000,000
Portfolio loans and leases	[2],[3]	91,970,000,000	92,098,000,000
Variable Interest Entity, Primary Beneficiary
Financing Receivable, Modifications
Portfolio loans and leases		1,297,000,000	1,216,000,000
Commercial Portfolio Segment
Financing Receivable, Modifications
Portfolio loans and leases		56,395,000,000	56,452,000,000
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Modifications
Restructured nonaccrual loans and leases			19,000,000
Nonperforming Financing Receivable
Financing Receivable, Modifications
Loans held for sale		6,000,000	13,000,000
Nonperforming Financing Receivable | Government Insured | Commercial Portfolio Segment
Financing Receivable, Modifications
Restructured nonaccrual loans and leases		3,000,000	1,000,000
Nonperforming Financing Receivable | Government Insured | Commercial Portfolio Segment | Small Business Administration
Financing Receivable, Modifications
Portfolio loans and leases		$ 3,000,000	$ 4,000,000

[1] Includes $ 399 and $ 686 of residential mortgage loans held for sale measured at fair value at December 31, 2017 and 2016 , respectively.

[2] Includes $ 0 and $ 85 of cash and due from banks, $ 62 and $ 0 of other short-term investments, $ 1,297 and $ 1,216 of portfolio loans and leases, $ (6) and $ (26) of ALLL, $ 7 and $ 9 of other assets, $ 2 and $ 3 of other liabilities and $ 1,190 and $ 1,094 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2017 and 2016 , respectively. For further information, refer to Note 11 .

[3] Includes $ 137 and $ 143 of residential mortgage loans measured at fair value at December 31, 2017 and 2016 , respecti vely.