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Shareholders' Equity - Key's and KeyBank's Actual Capital Amounts and Ratios, Minimum Capital Amounts and Ratios (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Key |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital to net risk-weighted assets, actual amount | $ 21,028 | $ 20,776
Tier 1 capital to net risk-weighted assets, actual amount | 17,340 | 17,225
Tier 1 capital to average quarterly tangible assets, amount | $ 17,340 | $ 17,225
Total capital to net risk-weighted assets, actual ratio | 0.1415 | 0.1279
Tier 1 capital to net risk-weighted assets, actual ratio | 0.1167 | 0.1060
Tier 1 capital to average quarterly tangible assets, actual ratio | 0.0903 | 0.0888
Total capital to net risk-weighted assets, to meet minimum capital adequacy requirements, amount | $ 11,886 | $ 12,998
Tier 1 capital to net risk-weighted assets, to meet minimum capital adequacy requirements, amount | 8,914 | 9,748
Tier 1 capital to average quarterly tangible assets to meet minimum capital adequacy requirements, amount | $ 7,678 | $ 7,759
Total capital to net risk-weighted assets, to meet minimum capital adequacy requirements, ratio | 0.0800 | 0.0800
Tier 1 capital to net risk-weighted assets, to meet minimum capital adequacy requirements, ratio | 0.0600 | 0.0600
Tier 1 capital to average quarterly tangible assets to meet minimum capital adequacy requirements, ratio | 0.0400 | 0.0400
KeyBank (consolidated) |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital to net risk-weighted assets, actual amount | $ 20,726 | $ 19,903
Tier 1 capital to net risk-weighted assets, actual amount | 17,487 | 16,801
Tier 1 capital to average quarterly tangible assets, amount | $ 17,487 | $ 16,801
Total capital to net risk-weighted assets, actual ratio | 0.1416 | 0.1239
Tier 1 capital to net risk-weighted assets, actual ratio | 0.1194 | 0.1046
Tier 1 capital to average quarterly tangible assets, actual ratio | 0.0922 | 0.0878
Total capital to net risk-weighted assets, to meet minimum capital adequacy requirements, amount | $ 11,712 | $ 12,850
Tier 1 capital to net risk-weighted assets, to meet minimum capital adequacy requirements, amount | 8,784 | 9,638
Tier 1 capital to average quarterly tangible assets to meet minimum capital adequacy requirements, amount | $ 7,587 | $ 7,657
Total capital to net risk-weighted assets, to meet minimum capital adequacy requirements, ratio | 0.0800 | 0.0800
Tier 1 capital to net risk-weighted assets, to meet minimum capital adequacy requirements, ratio | 0.0600 | 0.0600
Tier 1 capital to average quarterly tangible assets to meet minimum capital adequacy requirements, ratio | 0.0400 | 0.0400
Total capital to net risk-weighted assets, to qualify as well capitalized under federal deposit insurance act, amount | $ 14,640 | $ 16,063
Tier 1 capital to net risk-weighted assets, to qualify as well capitalized under federal deposit insurance act, amount | 11,712 | 12,850
Tier 1 capital to average quarterly tangible assets to qualify as well capitalized under federal deposit insurance act, amount | $ 9,483 | $ 9,572
Total capital to net risk-weighted assets, to qualify as well capitalized under federal deposit insurance act, ratio | 0.1000 | 0.1000
Tier 1 capital to net risk-weighted assets, to qualify as well capitalized under federal deposit insurance act, ratio | 0.0800 | 0.0800
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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