Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 82,983	[1],[2],[3]	$ 80,953	[4],[5],[6]	$ 79,154	[7],[8],[9]
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	46,913	[1]	45,472	[4]	44,169	[7]
Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	33,344		30,783		29,258
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	4,973		5,266		5,446
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	4,375		4,872		4,884
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	672		1,020		1,213
Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,549		3,531		3,368
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	41,071		38,197		36,599
Pass | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	30,372		27,199		25,510
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,886		3,893		4,080
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,981		3,328		3,293
Pass | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	362		343		418
Pass | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,470		3,434		3,298
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,560		3,016		3,010
Special Mention | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,539		1,641		1,598
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	394		567		562
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	486		521		550
Special Mention | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	96		235		258
Special Mention | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	45		52		42
Risk Level, Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,237		4,050		4,359
Risk Level, Substandard | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,398		1,831		2,023
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	690		778		785
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	902		984		1,013
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	213		413		511
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	34		44		27
Risk Level, Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	45		209		201
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	35		112		127
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3		28		19
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	6		39		28
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	1		29		26
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases			$ 1		$ 1

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

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

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

[6] 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.

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

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

[9] 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.