Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired
Unpaid Principal Balance	$ 3,092		$ 3,168
Recorded Investment	2,759	[1]	2,823	[2]
Allowance	271		295
Commercial Portfolio Segment | Variable Interest Entity, Primary Beneficiary | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired
Unpaid Principal Balance	29
Recorded Investment	29
Allowance	11
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	441		431
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	159		177
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	1,201		1,175
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	111		123
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status
Financing Receivable, Impaired
Recorded Investment	482		480
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status
Financing Receivable, Impaired
Recorded Investment	$ 63		$ 64

[1] Includes $441, $1,201 and $482, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $159, $111 and $63, 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.