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BORROWED FUNDS - Short Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term Debt [Line Items] |  |
Total short-term borrowed funds | $ 1,077 | $ 1,317
Federal funds purchased |  |
Short-term Debt [Line Items] |  |
Total short-term borrowed funds | 600 | 820
Securities sold under agreements to repurchase |  |
Short-term Debt [Line Items] |  |
Total short-term borrowed funds | 267 | 336
Other short-term borrowed funds |  |
Short-term Debt [Line Items] |  |
Total short-term borrowed funds | $ 210 | $ 161

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