Summary of Average Impaired Loans and Leases and Interest Income by Class (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 2,208		$ 3,202
Interest Income Recognized	19		27
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	742		832
Interest Income Recognized	5		5
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	112	[1]	162	[1]
Interest Income Recognized	1	[1]	1	[1]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	262		273
Interest Income Recognized	2		2
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	62		114
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	5		22
Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	552		1,312
Interest Income Recognized	6		13
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	375		406
Interest Income Recognized	3		5
Consumer Portfolio Segment | Automobile Loan Securitizations
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	23		24
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	75		57
Interest Income Recognized	$ 2		$ 1

[1] Excludes five restructured nonaccrual loans 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 at March 31, 2015 and March 31, 2014 and an immaterial amount of interest income recognized for the three months ended March 31, 2015 and March 31, 2014.