Summary of Average Impaired Loans and Leases and Interest Income by Class (Parenthetical) (Detail) $ in Millions	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)		Jun. 30, 2015 USD ($) number		Jun. 30, 2014 USD ($) number		Dec. 31, 2014 number
Financing Receivable, Impaired [Line Items]
Average Recorded Investment | $	$ 2,152		$ 3,030		$ 2,184		$ 3,117
Number of Contracts					7,676	[1],[2]	4,698	[3],[4]
Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Number of Contracts					5				5
Commercial Portfolio Segment | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Number of Contracts									5
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment | $	$ 98	[5]	$ 146	[6]	$ 103	[5]	$ 154	[6]
Number of Contracts					13	[1],[2]	20	[3],[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Average Recorded Investment | $					$ 28		$ 28
Number of Contracts					5		5

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

[2] Represents number of loans post-modification.

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

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

[5] Excludes five restructured nonaccrual 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 $28 and an immaterial amount of interest income recognized for the three months and six months ended June 30, 2015.

[6] Excludes five restructured nonaccrual 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 $28 and an immaterial amount of interest income recognized for the three and six months ended June 30, 2014.