Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Detail) - USD ($) $ in Millions	Sep. 30, 2015		Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 93,401	[1]	$ 89,976	[2]
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	57,008		53,953
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	42,948		40,765
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,759		3,834
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,302		3,565
Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,101		2,069
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,898		3,720
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	53,236		50,285
Pass | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	39,860		38,013
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,427		3,430
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,076		3,198
Pass | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,083		1,966
Pass | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,790		3,678
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,613		1,639
Special Mention | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,376		1,352
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	121		137
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	48		76
Special Mention | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases			65
Special Mention | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	68		9
Risk Level, Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,153		2,022
Risk Level, Substandard | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,712		1,400
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	211		267
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	178		284
Risk Level, Substandard | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	12		38
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	40		33
Risk Level, Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	6		7
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases			$ 7
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 6

[1] Excludes $173 of residential mortgage loans measured at fair value.

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