Credit Quality (Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class) (Detail) - USD ($) $ in Millions	Mar. 31, 2017		Dec. 31, 2016
Financing Receivable, Modifications
Total loans and leases	$ 91,487	[1],[2]	$ 91,955	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	56,373		56,452
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	41,074		41,676
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	3,410		3,360
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,514		3,539
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	4,283		3,903
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	4,092		3,974
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	53,087		53,274
Pass | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	38,187		38,844
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	3,226		3,168
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,429		3,466
Pass | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	4,238		3,902
Pass | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	4,007		3,894
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	1,455		1,335
Special Mention | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	1,255		1,204
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	74		72
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	25		4
Special Mention | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	45		1
Special Mention | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	56		54
Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	1,829		1,816
Substandard | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	1,630		1,604
Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	110		117
Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	60		69
Substandard | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	0		0
Substandard | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	29		26
Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	2		27
Doubtful | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	2		24
Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	0		3
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 $ 141 of residential mortgage loans measured at fair value, and includes $ 7 03 of leveraged leases, net of unearned income at March 31, 2017 .

[2] Excludes $ 141 of residential mortgage loans measured at fair value at March 31, 2017 .

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

[4] Excludes $ 143 of residential mortgage loans measured at fair value, and includes $ 701 of leveraged leases, net of unearned income at December 31, 2016 .