Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Detail) - USD ($) $ in Millions		Sep. 30, 2015		Jun. 30, 2015	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and due from banks		$ 2,455	[1]		$ 3,091	[1]	$ 3,125		$ 3,178
Commercial mortgage loans		7,061			7,399
Automobile loans		11,826			12,037
ALLL		(1,261)	[1]	$ (1,293)	(1,322)	[1]	$ (1,414)	$ (1,458)	$ (1,582)
Other assets	[1]	8,702			8,241
Liabilities
Other liabilities	[1]	2,614			2,642
Long-term debt	[1]	15,527			14,967
Noncontrolling interests		32			39
Variable Interest Entity, Primary Beneficiary
Assets
Cash and due from banks		137			179
Commercial mortgage loans		48			47
Automobile loans		2,131			3,331
ALLL		(27)			(22)
Other assets		18			25
Total Assets		2,307			3,560
Liabilities
Other liabilities		3			5
Long-term debt		2,136			3,434
Total liabilities		2,139			3,439
Noncontrolling interests		32			39
Variable Interest Entity, Primary Beneficiary | Automobile Loan [Member]
Assets
Cash and due from banks		136			178
Automobile loans		2,131			3,331
ALLL		(9)			(11)
Other assets		17			23
Total Assets		2,275			3,521
Liabilities
Other liabilities		3			5
Long-term debt		2,136			3,434
Total liabilities		2,139			3,439
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments
Assets
Cash and due from banks		1			1
Commercial mortgage loans		48			47
ALLL		(18)			(11)
Other assets		1			2
Total Assets		32			39
Liabilities
Noncontrolling interests		$ 32			$ 39

[1] Includes $137 and $179 of cash and due from banks, $2,179 and $3,378 of portfolio loans and leases, $(27) and $(22) of ALLL, $18 and $25 of other assets, $3 and $5 of other liabilities, and $2,136 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2015 and December 31, 2014, respectively. For further information refer to Note 11.