Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended						9 Months Ended	12 Months Ended	9 Months Ended					9 Months Ended						9 Months Ended											9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013		Sep. 30, 2014 Variable Interest Entity, Primary Beneficiary	Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary	Sep. 30, 2014 Commercial Portfolio Segment Commercial and Industrial Loans		Sep. 30, 2013 Commercial Portfolio Segment Commercial and Industrial Loans		Dec. 31, 2013 Commercial Portfolio Segment Commercial and Industrial Loans	Sep. 30, 2014 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Sep. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Dec. 31, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Owner Occupied		Sep. 30, 2014 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Sep. 30, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied		Dec. 31, 2013 Commercial Portfolio Segment Commercial Mortgage Loans, Non Owner Occupied	Sep. 30, 2014 Commercial Portfolio Segment Troubled Debt Restructuring On Accrual Status	Dec. 31, 2013 Commercial Portfolio Segment Troubled Debt Restructuring On Accrual Status	Sep. 30, 2014 Commercial Portfolio Segment Troubled Debt Restructuring On Nonaccrual Status	Dec. 31, 2013 Commercial Portfolio Segment Troubled Debt Restructuring On Nonaccrual Status	Sep. 30, 2014 Commercial Portfolio Segment Troubled Debt Restructuring On Nonaccrual Status Commercial Mortgage Loans, Owner Occupied Variable Interest Entity, Primary Beneficiary	Dec. 31, 2013 Commercial Portfolio Segment Troubled Debt Restructuring On Nonaccrual Status Commercial Mortgage Loans, Owner Occupied Variable Interest Entity, Primary Beneficiary	Sep. 30, 2014 Residential Mortgage Loans		Sep. 30, 2013 Residential Mortgage Loans		Dec. 31, 2013 Residential Mortgage Loans	Sep. 30, 2014 Residential Mortgage Loans Troubled Debt Restructuring On Accrual Status	Dec. 31, 2013 Residential Mortgage Loans Troubled Debt Restructuring On Accrual Status	Sep. 30, 2014 Residential Mortgage Loans Troubled Debt Restructuring On Nonaccrual Status	Dec. 31, 2013 Residential Mortgage Loans Troubled Debt Restructuring On Nonaccrual Status	Sep. 30, 2014 Consumer Portfolio Segment Troubled Debt Restructuring On Accrual Status	Dec. 31, 2013 Consumer Portfolio Segment Troubled Debt Restructuring On Accrual Status	Sep. 30, 2014 Consumer Portfolio Segment Troubled Debt Restructuring On Nonaccrual Status	Dec. 31, 2013 Consumer Portfolio Segment Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 3,345				$ 3,620																								$ 28	$ 28
Recorded Investment	3,039	[1]			3,353	[2]																			885	869	201	228	28	28						1,190	1,241	60	84	420	444	54	52
Allowance	$ 378				$ 367				$ 172				$ 145	$ 7	[3]			$ 11	[4]	$ 5				$ 14					$ 10	$ 11	$ 127				$ 139
Number of Contracts	6,916	[5],[6]	8,920	[5],[6]			5	5	83	[5],[6]	119	[5],[6]		25	[5],[6]	56	[5],[6],[7]			19	[5],[6]	50	[5],[6]								812	[5],[6]	1,266	[5],[6]

[1] Includes $885, $1,190 and $420, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $201, $60 and $54, 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. Excludes five restructured 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.

[3] Excludes five restructured loans at September 30, 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.

[4] Excludes five restructured 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.

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

[6] Represents number of loans post-modification.

[7] Excludes five loans modified in a TDR during the nine months ended September 30, 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, ALLL increased $7 upon modification, and a charge-off of $2 was recognized upon modification.