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Condensed Financial Information of the Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
OPERATING ACTIVITIES |  |  |
Net income (loss) attributable to Key | $ 967 | $ 1,917 | $ 2,625
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes (benefit) | (108) | (27) | 146
Stock-based compensation expense | 121 | 120 | 104
Other operating activities, net | 1,393 | 382 | (615)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES | 2,903 | 4,469 | 1,153
INVESTING ACTIVITIES |  |  |
Net (increase) decrease in securities available for sale and in short-term and other investments | (8,385) | 8,578 | 5,184
Proceeds from sales, prepayments and maturities of securities available for sale | 3,225 | 4,545 | 7,623
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES | 1,417 | (10,934) | (15,068)
FINANCING ACTIVITIES |  |  |
Net proceeds from issuance of long-term debt | 5,240 | 16,596 | 1,203
Payments on long-term debt | (5,052) | (8,580) | (2,566)
Repurchase of Treasury Shares | 0 | 0 | (585)
Cash dividends paid | (911) | (854) | (823)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | (4,266) | 6,439 | 13,737
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS | 54 | (26) | (178)
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR | 887 | 913 | 1,091
CASH AND DUE FROM BANKS AT END OF YEAR | 941 | 887 | 913
Key |  |  |
OPERATING ACTIVITIES |  |  |
Net income (loss) attributable to Key | 967 | 1,917 | 2,625
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes (benefit) | (6) | 6 | (22)
Stock-based compensation expense | 9 | 117 | 9
Equity in net (income) loss less dividends from subsidiaries | (575) | (1,521) | (754)
Net (increase) decrease in other assets | 44 | 23 | 13
Net increase (decrease) in other liabilities | 3 | (24) | 48
Other operating activities, net | 122 | (480) | (414)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES | 564 | 38 | 1,505
INVESTING ACTIVITIES |  |  |
Net (increase) decrease in securities available for sale and in short-term and other investments | (14) | (26) | (15)
Proceeds from sales, prepayments and maturities of securities available for sale | 0 | 0 | 0
Net (increase) decrease in loans to subsidiaries | 16 | (200) | 0
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES | 2 | (226) | (15)
FINANCING ACTIVITIES |  |  |
Net proceeds from issuance of long-term debt | 0 | 1,350 | 0
Payments on long-term debt | 0 | 0 | (997)
Repurchase of Treasury Shares | (73) | (44) | (1,176)
Net cash from the issuance (redemption) of Common Shares and preferred stock | 0 | 590 | 0
Cash dividends paid | (912) | (855) | (823)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | (985) | 1,041 | (2,996)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS | (419) | 853 | (1,506)
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR | 3,146 | 2,293 | 3,799
CASH AND DUE FROM BANKS AT END OF YEAR | $ 2,727 | $ 3,146 | $ 2,293

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