Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified													12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2013 Residential Mortgage		Dec. 31, 2012 Residential Mortgage		Mar. 31, 2013 Federal Housing Administration Loan	Dec. 31, 2012 Federal Housing Administration Loan	Mar. 31, 2013 Residential Mortgage Loans	Dec. 31, 2012 Residential Mortgage Loans	Dec. 31, 2012 Residential Mortgage Loans Federal Housing Administration Loan
Financing Receivable, Recorded Investment, Past Due
Portfolio loans and leases at fair value											$ 81	$ 76
Financing Receivable Recorded Investment 30 To 89 Days Past Due	384	[1],[2],[3]	413	[1],[4],[5]	73	[1],[2],[6]	87	[1],[4],[7]	71	80
Past Due 90 Days and Greater	846	[1],[2],[3]	912	[1],[4],[5]	290	[1],[2],[6]	307	[1],[4],[7]	414	414
Losses Due To Claim Denials And Curtailments													$ 2

[1] Includes accrual and nonaccrual loans and leases.

[2] Excludes $81 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 SBA at March 31, 2013.

[4] Excludes $76 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 SBA at December 31, 2012.

[6] 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 March 31, 2013, $71 of these loans were 30-89 days past due and $414 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses during the three months ended March 31, 2013 due to claim denials and curtailments associated with these advances.

[7] 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, 2012, $80 of these loans were 30-89 days past due and $414 were 90 days or more past due. The Bancorp recognized $2 of losses for the year ended December 31, 2012 due to claim denials and curtailments associated with these advances.