Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 89,976	[1],[2]	$ 88,522	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	53,953		52,046
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	40,765		39,316
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,834		4,507
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,565		3,559
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,069		1,039
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,720		3,625
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	50,285		47,922
Pass | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	38,013		36,776
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,430		3,866
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,198		2,879
Pass | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,966		855
Pass | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,678		3,546
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,639		1,663
Special Mention | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,352		1,118
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	137		209
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	76		248
Special Mention | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	65		32
Special Mention | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	9		56
Risk Level, Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,022		2,440
Risk Level, Substandard | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,400		1,419
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	267		415
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	284		431
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Modifications [Line Items]
Total loans and leases	38		152
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	33		23
Risk Level, Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	7		21
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases			3
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases			17
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 7		$ 1

[1] Excludes $108 of residential mortgage loans measured at fair value, and includes $874 of leveraged leases, net of unearned income.

[2] Excludes $108 of loans measured at fair value.

[3] Excludes $92 of residential mortgage loans measured at fair value, and includes $881 of leveraged leases, net of unearned income.

[4] Excludes $92 of loans measured at fair value.