Shareholders' Equity	9 Months Ended
Sep. 30, 2017
Equity [Abstract]
Shareholder' Equity	18. Shareholders' Equity Comprehensive Capital Plan As previously reported and as authorized by the Board and pursuant to our 2017 capital plan (which is effective through the second quarter of 2018) submitted and not objected to by the Federal Reserve, we have authority to repurchase up to $800 million of our common shares. We completed $277 million of Common Share repurchases, including $271 million of Common Share repurchases in the open market and $6 million of Common Share repurchases related to employee equity compensation programs, in the third quarter of 2017 under this authorization. Consistent with our 2017 capital plan, the Board declared a quarterly dividend of $.095 per Common Share, which equated to $102 million for the third quarter of 2017. Potential dividend increases were also included in our 2017 capital plan. In the fourth quarter of 2017, the Board plans to consider a potential increase in our quarterly common share dividend, up to $.105 per share, consistent with the 2017 capital plan. An additional potential increase in the quarterly common share dividend, up to $.12 per share, is expected to be considered by the Board for the second quarter of 2018. Preferred Stock On March 9, 2017, we announced that all of our 7.75% Noncumulative Perpetual Convertible Series A Preferred Stock would convert into KeyCorp Common Shares. On March 20, 2017, the conversion date, holders of the Series A Preferred Stock received 7.0922 Common Shares for each share of Series A Preferred Stock. Cash was paid in lieu of fractional shares. Prior to the conversion of the Series A Preferred Stock, we made a quarterly dividend payment of $1.9375 per share, or $6 million, on our Series A Preferred Stock during the first quarter of 2017. Prior to the redemption, we had $290 million of 7.75% Noncumulative Perpetual Convertible Series A Preferred Stock outstanding at December 31, 2016. Our Series A Preferred Stock had a $1 par value and a $100 liquidation preference. There were 7,475,000 shares authorized and 2,900,234 shares outstanding at December 31, 2016. As previously reported, on January 12, 2017, we provided notice of our intention to redeem all outstanding shares of the Series C Preferred Stock on February 15, 2017. On February 15, 2017, the Series C Preferred Stock was redeemed for cash at a redemption price of $25 per share. The redemption date was also a dividend payment date, and declared dividends of $.539063 per share, or $7 million, were also paid separately on February 15, 2017. The Series C Preferred Stock was initially issued in connection with the First Niagara acquisition to replace First Niagara’s outstanding preferred stock. Prior to the redemption, we had $350 million of Fixed-to-Floating Rate Perpetual Noncumulative Series C Preferred Stock. Our Series C Preferred Stock had a $1 par value with a $25 liquidation preference. There were 14,000,000 shares authorized and outstanding at December 31, 2016. We have $525 million of depositary shares, each representing a 1/25^th ownership interest in a share of our Fixed-to-Floating Rate Perpetual Noncumulative Series D Preferred Stock outstanding at September 30, 2017, and December 31, 2016. Our Series D Preferred Stock has a $1 par value with a $25,000 liquidation preference. There are 21,000 shares authorized and outstanding at September 30, 2017, and December 31, 2016. We made payments of $12.50 per depository share on the depositary shares related to our Series D Preferred Stock during the third quarter of 2017, for a total of $7 million. We have $500 million of depositary shares, each representing a 1/40^th ownership interest in a share of our Fixed-to-Floating Rate Perpetual Noncumulative Series E Preferred Stock outstanding at September 30, 2017, and December 31, 2016. Our Series E Preferred Stock has a $1 par value with a $1,000 liquidation preference. There are 500,000 shares authorized and outstanding at September 30, 2017, and December 31, 2016. We made payments of $.382813 per depositary share on the depositary shares related to our Series E Preferred Stock during the third quarter of 2017, for a total of $8 million.

18. Shareholders' Equity

Comprehensive Capital Plan

As previously reported and as authorized by the Board and pursuant to our 2017 capital plan (which is effective through the second quarter of 2018) submitted and not objected to by the Federal Reserve, we have authority to repurchase up to $800 million of our common shares. We completed $277 million of Common Share repurchases, including $271 million of Common Share repurchases in the open market and $6 million of Common Share repurchases related to employee equity compensation programs, in the third quarter of 2017 under this authorization.

Consistent with our 2017 capital plan, the Board declared a quarterly dividend of $.095 per Common Share, which equated to $102 million for the third quarter of 2017. Potential dividend increases were also included in our 2017 capital plan. In the fourth quarter of 2017, the Board plans to consider a potential increase in our quarterly common share dividend, up to $.105 per share, consistent with the 2017 capital plan. An additional potential increase in the quarterly common share dividend, up to $.12 per share, is expected to be considered by the Board for the second quarter of 2018.

Preferred Stock

On March 9, 2017, we announced that all of our 7.75% Noncumulative Perpetual Convertible Series A Preferred Stock would convert into KeyCorp Common Shares. On March 20, 2017, the conversion date, holders of the Series A Preferred Stock received 7.0922 Common Shares for each share of Series A Preferred Stock. Cash was paid in lieu of fractional shares. Prior to the conversion of the Series A Preferred Stock, we made a quarterly dividend payment of $1.9375 per share, or $6 million, on our Series A Preferred Stock during the first quarter of 2017.

Prior to the redemption, we had $290 million of 7.75% Noncumulative Perpetual Convertible Series A Preferred Stock outstanding at December 31, 2016. Our Series A Preferred Stock had a $1 par value and a $100 liquidation preference. There were 7,475,000 shares authorized and 2,900,234 shares outstanding at December 31, 2016.

As previously reported, on January 12, 2017, we provided notice of our intention to redeem all outstanding shares of the Series C Preferred Stock on February 15, 2017. On February 15, 2017, the Series C Preferred Stock was redeemed for cash at a redemption price of $25 per share. The redemption date was also a dividend payment date, and declared dividends of $.539063 per share, or $7 million, were also paid separately on February 15, 2017. The Series C Preferred Stock was initially issued in connection with the First Niagara acquisition to replace First Niagara’s outstanding preferred stock.

Prior to the redemption, we had $350 million of Fixed-to-Floating Rate Perpetual Noncumulative Series C Preferred Stock. Our Series C Preferred Stock had a $1 par value with a $25 liquidation preference. There were 14,000,000 shares authorized and outstanding at December 31, 2016.

We have $525 million of depositary shares, each representing a 1/25^th ownership interest in a share of our Fixed-to-Floating Rate Perpetual Noncumulative Series D Preferred Stock outstanding at September 30, 2017, and December 31, 2016. Our Series D Preferred Stock has a $1 par value with a $25,000 liquidation preference. There are 21,000 shares authorized and outstanding at September 30, 2017, and December 31, 2016. We made payments of $12.50 per depository share on the depositary shares related to our Series D Preferred Stock during the third quarter of 2017, for a total of $7 million.

We have $500 million of depositary shares, each representing a 1/40^th ownership interest in a share of our Fixed-to-Floating Rate Perpetual Noncumulative Series E Preferred Stock outstanding at September 30, 2017, and December 31, 2016. Our Series E Preferred Stock has a $1 par value with a $1,000 liquidation preference. There are 500,000 shares authorized and outstanding at September 30, 2017, and December 31, 2016. We made payments of $.382813 per depositary share on the depositary shares related to our Series E Preferred Stock during the third quarter of 2017, for a total of $8 million.