Credit Quality (Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class) (Detail) - USD ($) $ in Millions	Jun. 30, 2018		Dec. 31, 2017
Financing Receivable, Modifications
Total loans and leases	$ 91,770	[1],[2]	$ 91,833	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	56,503		56,395
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	41,403		41,170
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	3,391		3,362
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,234		3,242
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	4,687		4,553
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	3,788		4,068
Pass | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	54,319		53,612
Pass | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	39,601		38,813
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	3,217		3,207
Pass | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	3,200		3,117
Pass | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	4,652		4,553
Pass | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	3,649		3,922
Special Mention | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	1,049		1,290
Special Mention | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	899		1,115
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	40		75
Special Mention | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	21		28
Special Mention | Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications
Total loans and leases	35		0
Special Mention | Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications
Total loans and leases	54		72
Substandard | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	1,117		1,486
Substandard | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	885		1,235
Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	134		80
Substandard | Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Total loans and leases	13		97
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	85		74
Doubtful | Commercial Portfolio Segment
Financing Receivable, Modifications
Total loans and leases	18		7
Doubtful | Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications
Total loans and leases	18		7
Doubtful | Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Modifications
Total loans and leases	0		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 $ 162 of residential mortgage loans measured at fair value and includes $ 65 0 of leveraged leases, net of unearned income at June 30, 2018 .

[2] Excludes $ 162 of residential mortgage loans measured at fair value at June 30, 2018 .

[3] Excludes $ 137 of residential mortga ge loans measured at fair value and includes $ 674 of leveraged leases, net of unearned income at December 31, 2017 .

[4] Excludes $ 137 of residential mortgage loans measured at fair value at December 31, 2017 .