Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 82,046	[1]	$ 80,953	[2],[3]	$ 77,411	[4],[5]
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	46,477	[6]	45,472	[2]	43,201	[4]
Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	32,155		30,783		27,344
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	5,176		5,266		5,281
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	4,733		4,872		5,229
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	901		1,020		1,980
Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,512		3,531		3,367
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	39,523		38,197		34,773
Pass | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	28,761		27,199		23,092
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,850		3,893		4,027
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,172		3,328		3,352
Pass | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	326		343		1,029
Pass | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,414		3,434		3,273
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,812		3,016		3,340
Special Mention | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,479		1,641		1,788
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	509		567		435
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	566		521		659
Special Mention | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	218		235		412
Special Mention | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	40		52		46
Risk Level, Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,977		4,050		4,865
Risk Level, Substandard | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,805		1,831		2,350
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	802		778		801
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	971		984		1,152
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	342		413		516
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	57		44		46
Risk Level, Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	165		209		223
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	110		112		114
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	15		28		18
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	24		39		66
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	15		29		23
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 1		$ 1		$ 2

[1] Excludes $67 of loans measured at fair value.

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

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

[4] Excludes $54 of residential mortgage loans measured at fair value, includes $1,039 of leveraged leases, net of unearned income.

[5] Excludes $54 of loans measured at fair value.

[6] Excludes $67 of residential mortgage loans measured at fair value, and includes $1,027 of leveraged leases, net of unearned income.