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Shareholders' Equity - Key's and KeyBank's Actual Capital Amounts and Ratios, Minimum Capital Amounts and Ratios (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Key [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Net Risk-Weighted Assets, Actual Amount | $ 16,731 | $ 15,953
Tier 1 Capital to Average Quarterly Tangible Assets, Amount | 14,207 | 13,712
Tier 1 Capital to Net Risk-Weighted Assets, Actual Amount | $ 14,207 | $ 13,712
Total Capital to Net Risk-Weighted Assets, Actual Ratio | 12.79% | 12.89%
Tier 1 Capital to Net Risk-Weighted Assets, Actual Ratio | 10.86% | 11.08%
Tier 1 Capital to Average Quarterly Tangible Assets, Actual Ratio | 9.87% | 9.89%
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount | $ 10,469 | $ 9,903
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount | 7,852 | 7,427
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Amount | $ 5,756 | $ 5,548
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio | 8.00% | 8.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio | 6.00% | 6.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Ratio | 4.00% | 4.00%
KeyBank (consolidated) [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Net Risk-Weighted Assets, Actual Amount | $ 16,313 | $ 15,432
Tier 1 Capital to Average Quarterly Tangible Assets, Amount | 14,091 | 13,575
Tier 1 Capital to Net Risk-Weighted Assets, Actual Amount | $ 14,091 | $ 13,575
Total Capital to Net Risk-Weighted Assets, Actual Ratio | 12.69% | 12.68%
Tier 1 Capital to Net Risk-Weighted Assets, Actual Ratio | 10.96% | 11.16%
Tier 1 Capital to Average Quarterly Tangible Assets, Actual Ratio | 9.91% | 9.93%
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount | $ 10,287 | $ 9,733
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Amount | 7,715 | 7,300
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Amount | $ 5,688 | $ 5,470
Total Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio | 8.00% | 8.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Meet Minimum Capital Adequacy Requirements, Ratio | 6.00% | 6.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Meet Minimum Capital Adequacy Requirements, Ratio | 4.00% | 4.00%
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount | $ 12,858 | $ 12,166
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount | 7,715 | 7,300
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Amount | $ 7,110 | $ 6,838
Total Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio | 10.00% | 10.00%
Tier 1 Capital to Net Risk-Weighted Assets, to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio | 6.00% | 6.00%
Tier 1 Capital to Average Quarterly Tangible Assets to Qualify as Well Capitalized Under Federal Deposit Insurance Act, Ratio | 5.00% | 5.00%

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