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			9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 572	[1]		$ 572	[1]		$ 616	[2]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	273	[1],[3]		273	[1],[3]		315	[2],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	299	[1],[3]		299	[1],[3]		301	[2],[4]
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	140			140			143
Residential Mortgage Loans | Federal Housing Administration Loan
Financing Receivable, Recorded Investment, Past Due
Total Past Due	274			274			312
Losses Due To Claim Denials And Curtailments	1		$ 2	4		$ 5
Residential Mortgage Loans | Federal Housing Administration Loan | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	76			76			110
Residential Mortgage Loans | Federal Housing Administration Loan | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 173			$ 173			$ 202

[1] Excludes $ 140 of residential mortgage loans measured at fair value at September 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 a ccrual and nonaccrual loans and leases.