Employee Benefits (Details Textual)	3 Months Ended
	Mar. 31, 2012 Age
Employee Benefits (Textual) [Abstract]
Age of employees under condition one	55
Age of employees under condition two	50
Period of service under condition one	5 years
Period of service under condition two	15 years
Minimum period of service at the time of termination hired before 2001	15 years	[1]
Condition under Retiree healthcare plan	We sponsor a retiree healthcare plan in which all employees age 55 with five years of service (or employees age 50 with 15 years of service who are terminated under conditions that entitle them to a severance benefit) are eligible to participate.
Death benefit plan	Death benefit plan that provides a death benefit for a very limited number of (i) former Key employees who retired from their employment with Key prior to 1994, (ii) former Key employees who elect a grandfathered pension benefit under the KeyCorp Cash Balance Pension Plan, and (iii) Key employees who otherwise were provided a historical death benefit at the time of their termination.

[1] For the three months ended March 31, 2012 and 2011, we did not have any impairment losses related to securities