Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 2,457		$ 3,620
Recorded Investment	2,233	[1]	3,353	[2]
Allowance	295		367
Number of Contracts	11,102	[3],[4]	11,291	[3],[4]	16,064	[3],[4]
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Allowance	149		145
Number of Contracts	128	[3],[4]	146	[3],[4]	108	[3],[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired [Line Items]
Allowance	14	[5]	11	[6]
Number of Contracts	32	[3],[4]	65	[3],[4],[7]	67	[3],[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Impaired [Line Items]
Allowance	4		14
Number of Contracts	28	[3],[4]	59	[3],[4]	67	[3],[4]
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	869		869
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	214		228
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member] | Commercial Mortgage Loans, Owner Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	28		28
Recorded Investment	28		28
Allowance	10		11
Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Number of Contracts	1,093	[3],[4]	1,620	[3],[4]	1,758	[3],[4]
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	485		1,241
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	33		84
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	420		444
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 63		$ 52

[1] Includes $869, $485 and $420, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $214, $33 and $63, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[2] Includes $869, $1,241 and $444, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $228, $84 and $52, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[3] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.

[4] Represents number of loans post-modification.

[5] Excludes five restructured nonaccrual 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 allowance of $10.

[6] Excludes five restructured nonaccrual loans at 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, with an unpaid principal balance of $28, a recorded investment of $28, and an allowance of $11.

[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, ALLL increased $7 upon modification, and a charge-off of $2 was recognized upon modification.