Stock-Based Compensation (Number of Shares to be issued upon Exercise of Outstanding Stock-Based Awards and Remaining Shares Available for Future Issuance under all Equity Compensation Plans) (Detail) shares in Thousands	Dec. 31, 2017 $ / shares shares
Employee Stock Ownership Plan (ESOP) Disclosures
Number of Shares to be Issued Upon Exercise	9,309
Shares Available for Future Issuance	27,340
Equity compensation plans
Employee Stock Ownership Plan (ESOP) Disclosures
Shares Available for Future Issuance	21,687	[1]
Restricted Stock Awards
Employee Stock Ownership Plan (ESOP) Disclosures
Number of Shares to be Issued Upon Exercise	2,321
Restricted Stock Units
Employee Stock Ownership Plan (ESOP) Disclosures
Number of Shares to be Issued Upon Exercise	6,986
Stock options
Employee Stock Ownership Plan (ESOP) Disclosures
Number of Shares to be Issued Upon Exercise	2
Weighted-Average Exercise Price Per Share | $ / shares	$ 16.5
Employee stock purchase plan
Employee Stock Ownership Plan (ESOP) Disclosures
Shares Available for Future Issuance	5,653	[2]

[1] Under the 2017 Incentive Compensation Plan, 17.5 million shares were authorized for issuance as SARs, RSAs, RSUs, stock options, performance share or unit awards, dividend or dividend equivalent rights and stock awards .

[2] Represents remaining shares of Fifth Third common stock under the Bancorp’s 1993 Stock Purchase Plan, as amended and restated, including an additional 1.5 million shares approved by shareholders on March 28, 2007 and an additional 12 million shares approved by shareholders on April 21, 2009 .