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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
OPERATING ACTIVITIES |  |  |
Net income (loss) attributable to Key | $ 1,717 | $ 1,866 | $ 1,296
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes (benefit) | 53 | 98 | 303
Stock-based compensation expense | 96 | 99 | 100
Other operating activities, net | 560 | 14 | (601)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES | 2,906 | 2,506 | 1,815
INVESTING ACTIVITIES |  |  |
Net decrease (increase) in short-term investments, excluding acquisitions | 1,290 | 1,885 | (1,672)
Proceeds from sales, prepayments and maturities of securities available for sale | 3,586 | 3,197 | 3,999
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES | (4,918) | (2,482) | (2,239)
FINANCING ACTIVITIES |  |  |
Net proceeds from issuance of long-term debt | 2,129 | 2,306 | 2,852
Payments on long-term debt | (3,634) | (2,880) | (748)
Repurchase of Treasury Shares | (835) | (1,098) | (664)
Cash dividends paid | (804) | (656) | (480)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | 2,066 | (17) | 418
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS | 54 | 7 | (6)
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR | 678 | 671 | 677
CASH AND DUE FROM BANKS AT END OF YEAR | 732 | 678 | 671
Key [Member] |  |  |
OPERATING ACTIVITIES |  |  |
Net income (loss) attributable to Key | 1,717 | 1,866 | 1,296
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes (benefit) | (43) | 109 | 38
Stock-based compensation expense | 8 | 8 | 11
Equity in net (income) loss less dividends from subsidiaries | (626) | (340) | (658)
Net (increase) decrease in other assets | 39 | (58) | 82
Net increase (decrease) in other liabilities | 11 | 8 | (82)
Other operating activities, net | 244 | 79 | (114)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES | 1,350 | 1,672 | 573
INVESTING ACTIVITIES |  |  |
Net decrease (increase) in short-term investments, excluding acquisitions | (6) | 1 | 47
Cash infusion from purchase of Cain Brothers | 0 | 0 | (90)
Proceeds from sales, prepayments and maturities of securities available for sale | 0 | 0 | 1
Net (increase) decrease in loans to subsidiaries | 15 | 200 | 0
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES | 9 | 201 | (42)
FINANCING ACTIVITIES |  |  |
Net proceeds from issuance of long-term debt | 750 | 1,250 | 0
Payments on long-term debt | (300) | (750) | 0
Repurchase of Treasury Shares | (868) | (1,145) | (730)
Net cash from the issuance (redemption) of Common Shares and preferred stock | 435 | 412 | (350)
Cash dividends paid | (804) | (656) | (480)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES | (787) | (889) | (1,560)
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS | 572 | 984 | (1,029)
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR | 3,241 | 2,257 | 3,286
CASH AND DUE FROM BANKS AT END OF YEAR | $ 3,813 | $ 3,241 | $ 2,257

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