Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified																			9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011		Sep. 30, 2012 Residential Mortgage		Dec. 31, 2011 Residential Mortgage		Sep. 30, 2011 Residential Mortgage		Sep. 30, 2012 Federal Housing Administration Loan	Dec. 31, 2011 Federal Housing Administration Loan	Sep. 30, 2011 Federal Housing Administration Loan	Sep. 30, 2012 Residential Mortgage Loans	Dec. 31, 2011 Residential Mortgage Loans	Sep. 30, 2011 Residential Mortgage Loans	Sep. 30, 2012 Residential Mortgage Loans Federal Housing Administration Loan	Sep. 30, 2011 Small Business Administration Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Portfolio loans and leases at fair value																$ 76	$ 65	$ 62
Financing Receivable Recorded Investment 30 To 89 Days Past Due	431	[1],[2],[3]	519	[1],[4],[5]	514	[1],[6],[7]	97	[1],[2],[8]	110	[1],[4],[9]	107	[1],[10],[6]	79	45	33					1
Past Due 90 Days and Greater	1,011	[1],[2],[3]	1,227	[1],[4],[5]	1,324	[1],[6],[7]	328	[1],[2],[8]	348	[1],[4],[9]	359	[1],[10],[6]	392	309	291
Losses Due To Claim Denials And Curtailments																			$ 2

[1] Includes accrual and nonaccrual loans and leases.

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

[3] 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.

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

[5] 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.

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

[7] 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.

[8] Information for current residential mortgage loans includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. As of September 30, 2012, $79 of these loans were 30-89 days past due and $392 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses during the three months ended September 30, 2012 and $2 of losses during the nine months ended September 30, 2012 due to claim denials and curtailments associated with these advances.

[9] Information for current residential mortgage loans includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. As of December 31, 2011, $45 of these loans were 30-89 days past due and $309 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses for the year ended December 31, 2011 due to claim denials and curtailments associated with these advances.

[10] Information for current residential mortgage loans includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. As of September 30, 2011, $33 of these loans were 30-89 days past due and $291 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses for the three and nine months ended September 30, 2011 due to claim denials and curtailments associated with these advances.