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BORROWED FUNDS - Short Term Borrowed Debt Key Data (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | 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 | [1] | 0.00% | 0.00% | 0.00% | 0.00% | 0.74%
Maximum amount outstanding at month-end during the period | [2] | $ 382 | $ 724 | $ 1,045 | $ 1,174 | $ 1,174
Average amount outstanding during the period | [2] | $ 643 | $ 733 | $ 598 | $ 807 | $ 776
Weighted-average interest rate during the period | [1] | 0.91% | 0.47% | 0.76% | 0.34% | 0.36%
Other short-term borrowed funds |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Weighted-average interest rate at period end | [1] | 2.41% | 1.47% | 2.41% | 1.47% | 1.72%
Maximum amount outstanding at month-end during the period |  | $ 2,502 | $ 1,755 | $ 2,502 | $ 3,508 | $ 3,508
Average amount outstanding during the period |  | $ 2,239 | $ 1,624 | $ 1,802 | $ 2,283 | $ 2,321
Weighted-average interest rate during the period | [1] | 2.45% | 1.48% | 2.38% | 1.22% | 1.32%
[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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