Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 3,125	[1]		$ 3,178	[1]	$ 2,887		$ 2,441
Commercial mortgage loans	7,564	[1]		8,066	[1]
Automobile loans	12,121	[1]		11,984	[1]
Allowance for loan and lease losses	(1,414)	[1]	(1,458)	(1,582)	[1]	(1,677)	(1,735)	(1,854)
Other assets	7,517	[1]		8,358	[1]
Liabilities
Other liabilities	2,533	[1]		3,487	[1]
Long-term debt	14,336	[1]		9,633	[1]
Noncontrolling interests	39			37
Variable Interest Entity, Primary Beneficiary
Assets
Cash and due from banks	150			49
Commercial mortgage loans	48			48
Automobile loans	2,785			1,010
Allowance for loan and lease losses	(19)			(15)
Other assets	26			13
Total Assets	2,990			1,105
Liabilities
Other liabilities	7			1
Long-term debt	2,882			1,048
Total liabilities	2,889			1,049
Noncontrolling interests	39			37
Variable Interest Entity, Primary Beneficiary | Automobile Loan Securitizations
Assets
Cash and due from banks	150			49
Automobile loans	2,785			1,010
Allowance for loan and lease losses	(8)			(2)
Other assets	24			11
Total Assets	2,951			1,068
Liabilities
Other liabilities	7			1
Long-term debt	2,882			1,048
Total liabilities	2,889			1,049
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments
Assets
Commercial mortgage loans	48			48
Allowance for loan and lease losses	(11)			(13)
Other assets	2			2
Total Assets	39			37
Liabilities
Noncontrolling interests	$ 39			$ 37

[1] Includes $150 and $49 of cash and due from banks, $48 and $48 of commercial mortgage loans, $2,785 and $1,010 of automobile loans, $(19) and $(15) of ALLL, $26 and $13 of other assets, $7 and $1 of other liabilities, and $2,882 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2014 and December 31, 2013, respectively. See Note 10.