Summary of Average Impaired Loans and Leases and Interest Income by Class (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 3,061		$ 2,942		$ 2,969
Interest Income Recognized	119		113		96
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	786		517		448
Interest Income Recognized	25		16		4
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	149	[1]	146	[1]	156
Interest Income Recognized	4	[1]	4	[1]	4
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	268		321		361
Interest Income Recognized	8		8		10
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	92		108		160
Interest Income Recognized	2		4		2
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	13		11		10
Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,273		1,311		1,276
Interest Income Recognized	54		53		47
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	394		429		439
Interest Income Recognized	20		23		24
Consumer Portfolio Segment | Automobile Loan Securitizations
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	24		29		38
Interest Income Recognized	1		1		1
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	62		68		80
Interest Income Recognized	5		4		4
Consumer Portfolio Segment | Consumer Other Financing Receivable
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			$ 2		$ 1

[1] Excludes five restructured nonaccrual loans at December 31, 2014 associated with a consolidated VIE, in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party, with an average recorded investment of $28 for the years ended December 31, 2014 and 2013 and an immaterial amount of interest income recognized for the years ended December 31, 2014 and 2013.