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BORROWED FUNDS - Short Term Borrowed Debt Key Data (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Federal funds purchased and securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate at period end | 0.41% | 1.72% | 0.74%
Maximum amount outstanding at month-end during the period | $ 1,499 | $ 1,282 | $ 1,174
Average amount outstanding during the period | $ 599 | $ 654 | $ 776
Weighted-average interest rate during the period | 1.36% | 0.92% | 0.36%
Other short-term borrowed funds |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate at period end | 3.85% | 2.73% | 1.33%
Maximum amount outstanding at month-end during the period | $ 511 | $ 1,110 | $ 2,759
Average amount outstanding during the period | $ 66 | $ 467 | $ 1,571
Weighted-average interest rate during the period | 2.50% | 2.10% | 1.09%

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