Credit Quality (Summary of Average Impaired Loans and Leases and Interest Income by Class) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired
Average Recorded Investment		$ 1,677	$ 1,946	$ 2,062
Interest Income Recognized		52	58	74
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Average Recorded Investment		579	691	663
Interest Income Recognized		10	10	21
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	[1]	35	63	92
Interest Income Recognized	[1]	0	1	2
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired
Average Recorded Investment		61	139	224
Interest Income Recognized		1	5	7
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Impaired
Average Recorded Investment		0	3	41
Interest Income Recognized		0	0	1
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired
Average Recorded Investment		3	5	5
Interest Income Recognized		0	0	0
Residential Portfolio Segment
Financing Receivable, Impaired
Average Recorded Investment		657	647	586
Interest Income Recognized		25	25	23
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired
Average Recorded Investment		281	325	361
Interest Income Recognized		12	12	13
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired
Average Recorded Investment		11	17	22
Interest Income Recognized		0	0	1
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired
Average Recorded Investment		50	56	68
Interest Income Recognized		$ 4	$ 5	$ 6

[1] Excludes five restructured loans associated with a consolid ated 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 $ 13 , $ 26 and $ 27 for t he years ended December 31, 2017 , 2016, and 2015, respectively. An immaterial amount of interest income was recognized during t he years ended December 31, 2017 , 2016, and 2015. Refer to Note 11 for further discus sion on the deconsolidation of the VIE associated with these loans i n the third quarter of 2017.