Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 540	[1]		$ 540	[1]		$ 616	[2]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	248	[1],[3]		248	[1],[3]		315	[2],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	292	[1],[3]		292	[1],[3]		301	[2],[4]
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	142			142			143
Residential Mortgage Loans | Federal Housing Administration Loan
Financing Receivable, Recorded Investment, Past Due
Total Past Due	280			280			312
Losses Due To Claim Denials And Curtailments	1		$ 1	3		$ 3
Residential Mortgage Loans | Federal Housing Administration Loan | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	79			79			110
Residential Mortgage Loans | Federal Housing Administration Loan | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 179			$ 179			$ 202

[1] Excludes $ 142 of residential mortgage loans measured at fair value at June 30, 2017 .

[2] Excludes $ 143 of residential mortgage loans measured at fair value at December 31, 2016 .

[3] Includes accrual and nonaccrual loans and leases.

[4] Includes accrual and nonaccrual loans and leases.