Credit Quality (Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class) (Detail) - USD ($) $ in Millions	Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Modifications
Total loans and leases	$ 91,955	[1]	$ 92,415	[2]
Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	56,452		56,156
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	41,676		42,131
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,360		3,659
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,539		3,298
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	3,903		3,214
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	3,974		3,854
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	53,274		52,130
Pass | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	38,844		38,756
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,168		3,344
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,466		3,105
Pass | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	3,902		3,201
Pass | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	3,894		3,724
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	1,335		1,917
Special Mention | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	1,204		1,633
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	72		124
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	4		63
Special Mention | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	1		4
Special Mention | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	54		93
Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	1,816		2,109
Substandard | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	1,604		1,742
Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	117		191
Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	69		130
Substandard | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	0		9
Substandard | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	26		37
Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	27		0
Doubtful | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	24		0
Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	3		0
Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	0		0
Doubtful | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	0		0
Doubtful | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	$ 0		$ 0

[1] Excludes $ 143 of residential mortgage loans measured at fair value at December 31, 2016 .

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