VIE (Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Assets
Other short-term investments	[1]	$ 2,753		$ 2,754
Cash and due from banks		2,514	[1]	2,392	[1]	$ 2,540	$ 3,091
Commercial mortgage loans		6,604		6,899
Automobile loans		9,112		9,983
ALLL		(1,196)	[1]	(1,253)	[1]	$ (1,272)	$ (1,322)
Other assets	[1]	6,975		7,844
Liabilities
Other liabilities	[1]	2,144		2,269
Long-term debt	[1]	14,904		14,388
Noncontrolling interests		20		27
Variable Interest Entity, Primary Beneficiary
Assets
Other short-term investments		62
Cash and due from banks				85
Commercial mortgage loans		20		46
Automobile loans		1,277		1,170
ALLL		(6)		(26)
Other assets		7		9
Total Assets		1,360		1,284
Liabilities
Other liabilities		2		3
Long-term debt		1,190		1,094
Total liabilities		1,192		1,097
Noncontrolling interests		20		27
Variable Interest Entity, Primary Beneficiary | Automobile Loans
Assets
Other short-term investments		62
Cash and due from banks				84
Commercial mortgage loans		0		0
Automobile loans		1,277		1,170
ALLL		(6)		(6)
Other assets		7		9
Total Assets		1,340		1,257
Liabilities
Other liabilities		2		3
Long-term debt		1,190		1,094
Total liabilities		1,192		1,097
Noncontrolling interests		0		0
Variable Interest Entity, Primary Beneficiary | Fifth Third Community Development Corporation Investments
Assets
Cash and due from banks		0		1
Commercial mortgage loans		20		46
Automobile loans		0		0
ALLL		0		(20)
Other assets		0		0
Total Assets		20		27
Liabilities
Other liabilities		0		0
Long-term debt		0		0
Total liabilities		0		0
Noncontrolling interests		$ 20		$ 27

[1] Includes $ 0 and $ 85 of cash and due from banks, $ 62 and $ 0 of other short-term investments, $ 1,297 and $ 1,216 of portfolio loans and leases, $ (6) and $ (26) of ALLL, $ 7 and $ 9 of other assets, $ 2 and $ 3 of other liabilities and $ 1,190 and $ 1,094 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2017 and 2016 , respectively. For further information, refer to Note 11 .