Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 2,985	[1]	$ 3,013	[2]	$ 2,957	[3]
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	481		390		243
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	157		160		149
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,125		1,117		1,083
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	130		141		121
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	499		495		515
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 71		$ 79		$ 148

[1] Includes $481, $1,125 and $499, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $157, $130 and $71, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[2] 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.

[3] Includes $243, $1,083, and $515, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $149, $121 and $148, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.