Summary of Average Impaired Loans and Leases and Interest Income by Class (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 3,006		$ 2,963		$ 3,081		$ 2,829
Interest Income Recognized	31		32		90		83
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	785		553		787		403
Interest Income Recognized	6		7		18		11
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	137	[1]	145	[2]	149	[1]	140	[2]
Interest Income Recognized	1	[1]	1	[2]	3	[1]	3	[2]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	261		322		264		326
Interest Income Recognized	2		2		6		6
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	84		103		100		109
Interest Income Recognized	1		1		2		3
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	10		8		15		10
Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,252		1,311		1,286		1,308
Interest Income Recognized	14		13		41		39
Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	392		426		398		433
Interest Income Recognized	5		6		16		17
Consumer Portfolio Segment | Automobile Loan Securitizations
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	23		27		24		29
Interest Income Recognized	1		1		1		1
Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	62		66		58		69
Interest Income Recognized	1		1		3		3
Consumer Portfolio Segment | Consumer Other Financing Receivable
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			$ 2				$ 2

[1] Excludes five restructured 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 for the three and nine months ended September 30, 2014 and an immaterial amount of interest income recognized for the three and nine months ended September 30, 2014.

[2] Excludes five restructured 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 $29 and $30 and an immaterial amount of interest income recognized for the three and nine months ended September 30, 2013.