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BORROWED FUNDS - Short Term Borrowed Debt Key Data (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Federal funds purchased and securities sold under agreements to repurchase |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Weighted-average interest rate at period end | [1] | 1.72% | 0.74% | 0.26%
Maximum amount outstanding at month-end during the period | [2] | $ 1,282 | $ 1,174 | $ 1,522
Average amount outstanding during the period | [2] | $ 654 | $ 776 | $ 947
Weighted-average interest rate during the period | [1] | 0.92% | 0.36% | 0.09%
Other short-term borrowed funds |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Weighted-average interest rate at period end | [1] | 2.50% | 1.72% | 0.94%
Maximum amount outstanding at month-end during the period |  | $ 2,509 | $ 3,508 | $ 5,461
Average amount outstanding during the period |  | $ 1,808 | $ 2,321 | $ 3,207
Weighted-average interest rate during the period | [1] | 2.42% | 1.32% | 0.64%
[1] | Rates exclude certain hedging costs.
[2] | Balances are net of certain short-term receivables associated with reverse repurchase agreements, as applicable.

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