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BORROWED FUNDS - Short Term Borrowed Debt Key Data (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Federal funds purchased and securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate at period end | 1.39% | 0.00% | 1.72%
Maximum amount outstanding at month-end during the period | $ 1,134 | $ 625 | $ 1,282
Average amount outstanding during the period | $ 640 | $ 645 | $ 654
Weighted-average interest rate during the period | 1.24% | 0.66% | 0.92%
Other short-term borrowed funds |  |  |
Short-term Debt [Line Items] |  |  |
Weighted-average interest rate at period end | 3.03% | 3.40% | 2.73%
Maximum amount outstanding at month-end during the period | $ 511 | $ 1,110 | $ 1,110
Average amount outstanding during the period | $ 58 | $ 588 | $ 467
Weighted-average interest rate during the period | 2.75% | 1.67% | 2.10%

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