Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 2,029		$ 2,457
Recorded Investment		1,842	[1]	2,233	[2]
Allowance		$ 220		$ 295
Number of Contracts	[3],[4]	14,472		11,102		11,291
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Allowance		$ 84		$ 149
Number of Contracts	[3],[4]	77		128		146
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired [Line Items]
Allowance		$ 5	[5]	$ 14	[6]
Number of Contracts	[3],[4]	18		32		65	[7]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 27		$ 28
Recorded Investment		27		28
Allowance		15		10
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Impaired [Line Items]
Allowance		$ 12		$ 4
Number of Contracts	[3],[4]	12		28		59
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 491		$ 869
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		203		214
Residential Portfolio Segment
Financing Receivable, Impaired [Line Items]
Allowance		$ 67		$ 65
Number of Contracts	[3],[4]	1,089		1,093		1,620
Residential Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 607		$ 485
Residential Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		23		33
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		372		420
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		$ 52		$ 63

[1] Includes $491, $607 and $372, respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $203, $23 and $52, respectively, of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at December 31, 2015.

[2] Includes $869, $485 and $420, respectively, of commercial, residential mortgage and consumer portfolio TDRs on accrual status and $214, $33 and $63, respectively, of commercial, residential mortgage and consumer portfolio TDRs on nonaccrual status at December 31, 2014.

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

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

[5] Excludes five restructured loans at December 31, 2015 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 unpaid principal balance of $27, a recorded investment of $27 and an ALLL of $15.

[6] Excludes five restructured loans at December 31, 2014 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 unpaid principal balance of $28, a recorded investment of $28 and an ALLL of $10.

[7] Excludes five loans modified in a TDR during the year ended December 31, 2013 associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party. The TDR had a recorded investment of $29 at modification, the ALLL increased $7 upon modification and a charge-off of $2 was recognized upon modification.