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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Key's and KeyBank's Actual Capital Amounts and Ratios, Minimum Capital Amounts and Ratios
At December 31, 2017, Key and KeyBank (consolidated) had regulatory capital in excess of all current minimum risk-based capital (including all adjustments for market risk) and leverage ratio requirements as shown in the following table.
 
Actual
 
To Meet Minimum
Capital Adequacy
Requirements
 
To Qualify as Well 
Capitalized Under Federal
Deposit Insurance Act
dollars in millions
Amount
Ratio
 
Amount
Ratio
 
Amount
Ratio
December 31, 2017
 
 
 
 
 
 
 
 
TOTAL CAPITAL TO NET RISK-WEIGHTED ASSETS
 
 
 
 
 
 
 
 
Key
$
15,345

12.92
%
 
$
9,505

8.00
%
 
N/A

N/A

KeyBank (consolidated)
14,957

12.86

 
9,306

8.00

 
$
11,633

10.00
%
TIER 1 CAPITAL TO NET RISK-WEIGHTED ASSETS
 
 
 
 
 
 
 
 
Key
$
13,083

11.01
%
 
$
7,129

6.00
%
 
N/A

N/A

KeyBank (consolidated)
13,110

11.27

 
6,980

6.00

 
$
6,980

6.00
%
TIER 1 CAPITAL TO AVERAGE QUARTERLY TANGIBLE ASSETS
 
 
 
 
 
 
 
 
Key
$
13,083

9.73
%
 
$
5,379

4.00
%
 
N/A

N/A

KeyBank (consolidated)
13,110

9.91

 
5,293

4.00

 
$
6,617

5.00
%
December 31, 2016
 
 
 
 
 
 
 
 
TOTAL CAPITAL TO NET RISK-WEIGHTED ASSETS
 
 
 
 
 
 
 
 
Key
$
15,638

12.85
%
 
$
9,734

8.00
%
 
N/A

N/A

KeyBank (consolidated)
14,291

12.36

 
9,251

8.00

 
$
11,564

10.00
%
TIER 1 CAPITAL TO NET RISK-WEIGHTED ASSETS
 
 
 
 
 
 
 
 
Key
$
13,249

10.89
%
 
$
7,300

6.00
%
 
N/A

N/A

KeyBank (consolidated)
12,439

10.76

 
6,939

6.00

 
$
6,939

6.00
%
TIER 1 CAPITAL TO AVERAGE QUARTERLY TANGIBLE ASSETS
 
 
 
 
 
 
 
 
Key
$
13,249

9.90
%
 
$
5,442

4.00
%
 
N/A

N/A

KeyBank (consolidated)
12,439

9.46

 
5,353

4.00

 
$
6,691

5.00
%