Summary of Average Impaired Loans and Leases and Interest Income by Class (Parenthetical) (Detail) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2016 USD ($) number	Mar. 31, 2015 USD ($)	Dec. 31, 2015 number
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		$ 1,954	$ 2,208
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	[1]	71	112
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		$ 27	$ 28
Number of Contracts | number		5		5

[1] 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 $27 and $28 at March 31, 2016 and March 31, 2015, respectively, and an immaterial amount of interest income recognized for both the three months ended March 31, 2016 and March 31, 2015.