Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	$ 179		$ 137
Total Past Due	599	[1]	638	[2]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	326	[1],[3]	333	[2],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	273	[1],[3]	305	[2],[4]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	179		137
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value	179		137
Residential Mortgage Loans | Federal Housing Administration Loan
Financing Receivable, Recorded Investment, Past Due
Losses Due To Claim Denials And Curtailments	5		5
Residential Mortgage Loans | Federal Housing Administration Loan | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	90		95
Residential Mortgage Loans | Federal Housing Administration Loan | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 195		$ 290

[1] Excludes $ 179 of residential mortgage loans measured at fair value at December 31, 2018 .

[2] Excludes $ 137 of residential mortgage loans measured at fair value at December 31, 2017 .

[3] Includes accrual and nonaccrual loans and leases.

[4] Includes accrual and nonaccrual loans and leases .