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, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Impaired
Average Recorded Investment	$ 1,581	$ 1,743		$ 1,546	$ 1,796
Interest Income Recognized	17	11		32	23
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Average Recorded Investment	417	635		439	668
Interest Income Recognized	5	1		10	2
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired
Average Recorded Investment	16	38	[1]	20	42	[1]
Interest Income Recognized	0	0		0	0	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	29	66		32	73
Interest Income Recognized	0	0		0	1
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Impaired
Average Recorded Investment		0			0
Interest Income Recognized		0			0
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired
Average Recorded Investment	18	2		14	3
Interest Income Recognized	0	0		0	0
Residential Mortgage Loans
Financing Receivable, Impaired
Average Recorded Investment	799	654		732	653
Interest Income Recognized	8	6		14	12
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired
Average Recorded Investment	248	287		253	293
Interest Income Recognized	3	3		6	6
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired
Average Recorded Investment	8	12		9	13
Interest Income Recognized	0	0		0	0
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired
Average Recorded Investment	46	49		47	51
Interest Income Recognized	$ 1	$ 1		$ 2	$ 2

[1] 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 $ 26 for both the three and six months ended June 30, 2017. An immaterial amount of interest income was recognized during the six months ended June 30, 2017. Refer to Note 9 for further discussion on the deconsolidation of the VIE associated with these loans in the third quarter of 2017.