Summary of the Bancorp's Nonperforming Loans and Leases by Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Loans held for sale	$ 1,802		$ 2,954		$ 1,840
OREO and other repossessed property	293	[1]	378	[1]	406	[1]
Portfolio loans and leases	82,983	[2],[3],[4]	80,953	[5],[6],[7]	79,154	[10],[8],[9]
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Portfolio loans and leases	46,913	[2]	45,472	[5]	44,169	[8]
Nonperforming Financing Receivable
Financing Receivable, Modifications [Line Items]
Portfolio loans and leases	347		380		383
Non Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Loans held for sale	43		138		197
Non Accrual Loans [Member] | Government Insured [Member] | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Restructured nonaccrual loans and leases	1		2
Non Accrual Loans [Member] | Government Insured [Member] | Commercial Portfolio Segment | Small Business Administration [Member]
Financing Receivable, Modifications [Line Items]
Portfolio loans and leases	11		17		19
Other Real Estate Owned [Member] | Government Insured [Member]
Financing Receivable, Modifications [Line Items]
OREO and other repossessed property	$ 73		$ 64		$ 58

[1] Excludes $73, $64 and $58 of OREO related to government insured loans at September 30, 2012, December 31, 2011 and September 30, 2011, respectively.

[2] Excludes $76 of residential mortgage loans measured at fair value, and includes $914 of leveraged leases, net of unearned income.

[3] Excludes $76 of loans measured at fair value.

[4] Includes an immaterial amount of government insured commercial loans 30-89 days and 90 days past due and accruing whose repayments are insured by the Small Business Administration at September 30, 2012.

[5] Excludes $65 of residential mortgage loans measured at fair value, and includes $1,022 of leveraged leases, net of unearned income.

[6] Excludes $65 of loans measured at fair value.

[7] Includes an immaterial amount of government insured commercial loans 30-89 and 90 days past due and accruing whose repayments are insured by the Small Business Administration at December 31, 2011.

[8] Excludes $62 of residential mortgage loans measured at fair value, includes $1,018 of leveraged leases, net of unearned income.

[9] Excludes $62 of loans measured at fair value.

[10] Includes $1 of government insured loans 30-89 days past due and accruing of government insured commercial loans whose repayments are insured by the Small Business Administration at September 30, 2011 and an immaterial amount of government insured commercial loans 90 days past due and still accruing.