Credit Quality (Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications
Total loans and leases	$ 109,375	$ 95,086
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases	69,958	59,571
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	50,542	44,340
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	4,880	3,284
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	6,083	3,690
Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	5,090	4,657
Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	3,363	3,600
Pass | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases	66,143	57,581
Pass | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	47,671	42,695
Pass | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	4,421	3,122
Pass | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	5,866	3,632
Pass | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	4,963	4,657
Pass | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	3,222	3,475
Special Mention | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases	1,825	901
Special Mention | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	1,423	779
Special Mention | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	162	23
Special Mention | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	135	27
Special Mention | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	52	0
Special Mention | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	53	72
Substandard | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases	1,944	1,076
Substandard | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	1,406	853
Substandard | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	293	139
Substandard | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	82	31
Substandard | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	75	0
Substandard | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	88	53
Doubtful | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases	46	13
Doubtful | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	42	13
Doubtful | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Total loans and leases	4	0
Doubtful | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	0	0
Doubtful | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	0	0
Doubtful | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	$ 0	$ 0