Credit Quality (Summary of the Average Impaired Loans and Leases and Interest Income by Class) (Parenthetical) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Financing Receivable, Impaired
Average Recorded Investment		$ 1,946	$ 2,062	$ 3,061
Number of Contracts	[1],[2]	10,978	14,472	11,102
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Impaired
Average Recorded Investment	[3]	$ 63	$ 92	$ 149
Number of Contracts	[1],[2]	12	18	32
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired
Average Recorded Investment		$ 26	$ 27	$ 27

[1] Represents number of loans post-modification and excludes loans previously modified in a TDR .

[2] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality which were accounted for within a pool .

[3] (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 $ 26 , $ 27 and $28 for the years ended December 31, 2016 , 2015 and 2014 , respectively . A n immaterial amount of interest income was recognized during the years ended December 31, 2016 , 2015 and 2014 .