Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Parenthetical) (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 547,000,000	[1]		$ 547,000,000	[1]		$ 635,000,000	[2]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	236,000,000	[1],[3]		236,000,000	[1],[3]		306,000,000	[2],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	311,000,000	[1],[3]		311,000,000	[1],[3]		329,000,000	[2],[4]
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	149,000,000			149,000,000			167,000,000
Residential Mortgage Loans | Federal Housing Administration Loan
Financing Receivable, Recorded Investment, Past Due
Losses Due To Claim Denials And Curtailments	2,000,000		$ 2,000,000	5,000,000		$ 6,000,000
Residential Mortgage Loans | Federal Housing Administration Loan | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	112,000,000			112,000,000			102,000,000
Residential Mortgage Loans | Federal Housing Administration Loan | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 287,000,000			$ 287,000,000			$ 335,000,000

[1] Excludes $ 149 of residential mortgage loans measured at fair value at September 30, 2016 .

[2] Excludes $ 167 of residential mortgage loans measured at fair value at December 31, 2015 .

[3] Includes accrual and nonaccrual loans and leases.

[4] Includes accrual and nonaccrual loans and leases.