Credit Quality (Summary of Average Impaired Loans and Leases and Interest Income by Class) (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Financing Receivable, Impaired
Average Recorded Investment	$ 1,743		$ 2,045		$ 1,796		$ 1,978
Interest Income Recognized	11		13		23		29
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Average Recorded Investment	635		762		668		684
Interest Income Recognized	1		2		2		4
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired
Average Recorded Investment	38	[1]	68	[2]	42	[1]	69	[2]
Interest Income Recognized	0	[1]	0	[2]	0	[1]	1	[2]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	66		152		73		160
Interest Income Recognized	0		1		1		3
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Impaired
Average Recorded Investment			2				4
Interest Income Recognized			0				0
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired
Average Recorded Investment	2		6		3		5
Interest Income Recognized	0		0		0		0
Residential Mortgage Loans
Financing Receivable, Impaired
Average Recorded Investment	654		651		653		644
Interest Income Recognized	6		6		12		12
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired
Average Recorded Investment	287		329		293		336
Interest Income Recognized	3		3		6		6
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired
Average Recorded Investment	12		18		13		18
Interest Income Recognized	0		0		0		0
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired
Average Recorded Investment	49		57		51		58
Interest Income Recognized	$ 1		$ 1		$ 2		$ 3

[1] (a) Excludes five restructured loans associated with a consolidated VIE in which the Bancorp has no continu ing credit risk due to the risk being assumed by a third party, with an average recorded investment of $ 2 6 and an immaterial amount of interest income recognized for both the three and six months ended June 30, 2017

[2] (a) Excludes five restructured loans associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party, with an average recorded investment of $ 27 and an immaterial amount of interest income recognized for both the three and six months ended June 30, 2016 .