Credit Quality (Summary of Average Impaired Loans and Leases and Interest Income by Class) (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired
Average Recorded Investment	$ 1,660	$ 1,973		$ 1,738	$ 1,963
Interest Income Recognized	14	16		37	45
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Average Recorded Investment	581	725		611	685
Interest Income Recognized	4	4		6	8
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired
Average Recorded Investment	50	62	[1]	55	66	[1]
Interest Income Recognized	0	0	[1]	0	1	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	40	139		69	152
Interest Income Recognized	0	2		1	4
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Impaired
Average Recorded Investment		0			3
Interest Income Recognized		0			0
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired
Average Recorded Investment	1	7		2	6
Interest Income Recognized	0	0		0	0
Residential Mortgage Loans
Financing Receivable, Impaired
Average Recorded Investment	654	651		655	646
Interest Income Recognized	6	6		18	19
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired
Average Recorded Investment	275	318		285	330
Interest Income Recognized	3	3		9	9
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired
Average Recorded Investment	11	16		12	18
Interest Income Recognized	0	0		0	0
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired
Average Recorded Investment	48	55		49	57
Interest Income Recognized	$ 1	$ 1		$ 3	$ 4

[1] (a) Excludes five restructured loans associated with a consolidated VIE in which the Bancorp had 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 nine months ended September 30, 2016 . Refer to Note 11 for further discussion on the deconsolidation of a VIE associated with these loans in the third quarter of 2017.