Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Detail) - USD ($) $ in Millions	Mar. 31, 2016		Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 93,445	[1]	$ 92,415	[2]
Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	57,681		56,156
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	43,433		42,131
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,613		3,659
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,251		3,298
Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,428		3,214
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,956		3,854
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	53,548		52,130
Pass | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	39,909		38,756
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,305		3,344
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,063		3,105
Pass | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,423		3,201
Pass | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	3,848		3,724
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,781		1,917
Special Mention | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,513		1,633
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	128		124
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	65		63
Special Mention | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1		4
Special Mention | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	74		93
Risk Level, Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	2,325		2,109
Risk Level, Substandard | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	1,987		1,742
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	177		191
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	123		130
Risk Level, Substandard | Commercial Portfolio Segment | Commercial construction loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	4		9
Risk Level, Substandard | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Total loans and leases	34		$ 37
Risk Level, Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications [Line Items]
Total loans and leases	27
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Total loans and leases	24
Risk Level, Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications [Line Items]
Total loans and leases	$ 3

[1] Excludes $160 of residential mortgage loans measured at fair value at March 31, 2016.

[2] Excludes $167 of residential mortgage loans measured at fair value at December 31, 2015.