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Derivatives and Hedging Activities - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) derivative rating | Dec. 31, 2018 USD ($) rating | Dec. 31, 2017 USD ($)
Credit Derivatives [Line Items] |  |  |  |
Derivative assets after effects of bilateral collateral and master netting agreements |  | $ 65,000,000 |  |
Derivative liabilities after effects of bilateral collateral and master netting agreements |  | 4,000,000 |  |
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses |  | 715,000,000 |  |
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses |  | 194,000,000 |  |
Reclassify of after-tax net losses on derivative instruments from AOCI |  | $ (132,000,000) |  |
Length of time hedge in cash flow hedge |  | 12 months |  |
Reclassification of net losses related to terminated cash flow hedges from AOCI to income |  | $ (3,000,000) |  |
Maximum length of time over which forecasted transactions are hedged, years |  | 10 years |  |
Other Comprehensive income unrealized gain on derivatives arising during period net of tax |  | $ 32,000,000 |  |
Other income | [1] | (68,000,000) | $ (176,000,000) | $ (153,000,000)
Cash collateral netted against derivative assets |  | 207,000,000 | 33,000,000 |
Collateral netted against derivative liabilities |  | 69,000,000 | 37,000,000 |
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements |  | 431,000,000 |  |
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements |  | 107,000,000 |  |
Over-collateralization on derivatives to broker-dealers and banks, after the application of master netting agreements and collateral |  | 105,000,000 |  |
Additional collateral held in the form of securities |  | 2,000,000 |  |
Default reserve associated with uncollateralized contracts |  | 27,000,000 |  |
Gross exposure on derivatives after taking into account effects of master netting agreements |  | 753,000,000 |  |
Net exposure on derivatives with clients after application of master netting agreements collateral and related reserve |  | 672,000,000 |  |
Net liability position totaled |  | $ 9,000,000 | $ 1,000,000 |
Number of credit risk derivatives held | derivative |  | 0 |  |
KeyBank (consolidated) [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Net liability position totaled |  | $ 62,000,000 |  |
Derivative assets included in net liability position |  | 25,000,000 |  |
Derivative liabilities included in net liability position |  | 87,000,000 |  |
Cash and securities collateral posted |  | $ 60,000,000 |  |
KeyBank (consolidated) [Member] | Unsecured Debt [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Number of ratings above noninvestment | rating |  | 4 | 4 |
KeyBank (consolidated) [Member] | Maximum [Member] | Unsecured Debt [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Payments to terminate contracts |  | $ 3,000,000 | $ 4,000,000 |
Key Corp [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Additional collateral held in the form of securities |  | 0 |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation Adjustment [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Other income |  | $ 14,000,000 | $ 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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