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Condensed Financial Information of the Parent Company - Condensed Statements of Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Other income | [1] | $ 68 | $ 176 | $ 153
Total interest income |  | 5,235 | 4,878 | 4,390
Interest on long-term debt with subsidiary trusts |  | 454 | 420 | 319
Income (loss) before income taxes and equity in net income (loss) less dividends from subsidiaries |  | 2,054 | 2,234 | 1,981
Income tax (expense) benefit |  | (314) | (344) | (637)
NET INCOME (LOSS) |  | 1,717 | 1,866 | 1,298
Less: Net income attributable to noncontrolling interests |  | 0 | 0 | 2
NET INCOME (LOSS) ATTRIBUTABLE TO KEY |  | 1,717 | 1,866 | 1,296
Key [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Interest income from subsidiaries |  | 9 | 11 | 10
Other income |  | 11 | 11 | 9
Total interest income |  | 1,294 | 1,697 | 769
Interest on long-term debt with subsidiary trusts |  | 22 | 20 | 17
Interest on other borrowed funds |  | 151 | 137 | 95
Personnel and other expense |  | 87 | 69 | 46
Total expense |  | 260 | 226 | 158
Income (loss) before income taxes and equity in net income (loss) less dividends from subsidiaries |  | 1,034 | 1,471 | 611
Income tax (expense) benefit |  | 57 | 55 | 29
Income (loss) before equity in net income (loss) less dividends from subsidiaries |  | 1,091 | 1,526 | 640
Equity in net income (loss) less dividends from subsidiaries |  | 626 | 340 | 658
NET INCOME (LOSS) |  | 1,717 | 1,866 | 1,298
Less: Net income attributable to noncontrolling interests |  | 0 | 0 | 2
NET INCOME (LOSS) ATTRIBUTABLE TO KEY |  | 1,717 | 1,866 | 1,296
Key [Member] | Banks [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Bank/Nonbank subsidiaries |  | 1,204 | 1,675 | 750
Key [Member] | Nonbank Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Bank/Nonbank subsidiaries |  | $ 70 | $ 0 | $ 0
[1] | Net securities gains (losses) totaled $20 million for the year ended December 31, 2019, less than $1 million for the year ended December 31, 2018, and $1 million for the year ended December 31, 2017. For 2019, 2018, and 2017, we did not have any impairment losses related to securities.

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