Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 2,941	[1]	$ 3,013	[2]	$ 3,056	[3]
Commercial Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	442		390		347
Commercial Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	153		160		189
Residential Mortgage Loans | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,150		1,117		1,103
Residential Mortgage Loans | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	129		141		134
Consumer Portfolio Segment | Troubled Debt Restructuring On Accrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	491		495		500
Consumer Portfolio Segment | Troubled Debt Restructuring On Nonaccrual Status [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 63		$ 79		$ 81

[1] Includes $442, $1,150 and $491, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $153, $129 and $63, 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 $347, $1,103, and $500, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $189, $134 and $81, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.