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
	Mar. 31, 2017		Mar. 31, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 524	[1]		$ 616	[2]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	229	[1],[3]		315	[2],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	295	[1],[3]		301	[2],[4]
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	141			143
Residential Mortgage Loans | Federal Housing Administration Loan
Financing Receivable, Recorded Investment, Past Due
Losses Due To Claim Denials And Curtailments	2		$ 2
Residential Mortgage Loans | Federal Housing Administration Loan | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	77			110
Residential Mortgage Loans | Federal Housing Administration Loan | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 302			$ 312

[1] Excludes $ 141 of residential mortgage loans measured at fair value at March 31, 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.