Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 3,013	[1]	$ 2,931	[2]
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	390		228
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	160		141
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,117		1,066
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	141		116
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	495		492
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 79		$ 90

[1] Includes $390, $1,117 and $495, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $160, $141 and $79, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[2] Includes $228, $1,066 and $492, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $141, $116 and $90, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.