Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Financing Receivable, Impaired
Unpaid Principal Balance	$ 3,550		$ 3,168
Recorded Investment	3,199	[1]	2,823	[2]
Allowance	342		295
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Allowance	122		65
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired
Allowance	11	[3]	5
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Impaired
Allowance	13		16
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	499		431
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	241		177
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status | Commercial Mortgage Loans, Owner Occupied | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Impaired
Unpaid Principal Balance	29
Recorded Investment	29
Allowance	11
Residential Mortgage Loans
Financing Receivable, Impaired
Allowance	135		137
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	1,233		1,175
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	83		123
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	461		480
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	$ 55		$ 64

[1] Includes $499, $1,233 and $461, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $241, $83 and $55, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[2] Includes $431, $1,175 and $480, respectively, of commercial, residential mortgage and consumer TDRs on accrual status;$177, $123 and $64, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[3] Excludes five restructured nonaccrual loans at September 30, 2013 associated with a consolidated variable interest entity, 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 $29, a recorded investment of $29, and an allowance of $11.