Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Impaired
Unpaid Principal Balance	$ 3,398		$ 3,620
Recorded Investment	3,071	[1]	3,353	[2]
Allowance	362		367
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired
Allowance	140		145
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired
Allowance	11	[3]	11	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Impaired
Allowance	12		14
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	847		869
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	209		228
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	28		28
Recorded Investment	28		28
Allowance	11		11
Residential Mortgage Loans
Financing Receivable, Impaired
Allowance	140		139
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	1,237		1,241
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	73		84
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	430		444
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	$ 53		$ 52

[1] Includes $847, $1,237 and $430, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $209, $73 and $53, 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 March 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 $11.

[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.