Credit Quality (Summary of Average Impaired Loans and Leases and Interest Income by Class) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Impaired
Average Recorded Investment	$ 1,539	$ 1,835
Interest Income Recognized	15	12
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Average Recorded Investment	497	683
Interest Income Recognized	5	1
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired
Average Recorded Investment	22	43	[1]
Interest Income Recognized	0	0
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	34	89
Interest Income Recognized	0	1
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired
Average Recorded Investment	6	3
Interest Income Recognized	0	0
Residential Mortgage Loans
Financing Receivable, Impaired
Average Recorded Investment	665	654
Interest Income Recognized	6	6
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired
Average Recorded Investment	258	298
Interest Income Recognized	3	3
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired
Average Recorded Investment	9	14
Interest Income Recognized	0	0
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired
Average Recorded Investment	48	51
Interest Income Recognized	$ 1	$ 1

[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 the three months ended March 31, 2017. An immaterial amount of interest income was recognized during the three months ended March 31, 2017. Refer to Note 9 for further discussion on the deconsolidation of the VIE associated with these loans in the third quarter of 2017.