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BORROWED FUNDS - Short Term Borrowed Debt Key Data (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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] | $ 1,045 | $ 1,075 | $ 1,045 | $ 1,174 | $ 1,174
Average amount outstanding during the period | [2] | $ 504 | $ 808 | $ 574 | $ 845 | $ 776
Weighted-average interest rate during the period | [1] | 0.71% | 0.36% | 0.68% | 0.28% | 0.36%
Other short-term borrowed funds |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Weighted-average interest rate at period end | [1] | 2.41% | 1.31% | 2.41% | 1.31% | 1.72%
Maximum amount outstanding at month-end during the period |  | $ 2,247 | $ 2,507 | $ 2,247 | $ 3,508 | $ 3,508
Average amount outstanding during the period |  | $ 1,677 | $ 2,275 | $ 1,579 | $ 2,617 | $ 2,321
Weighted-average interest rate during the period | [1] | 2.49% | 1.22% | 2.33% | 1.14% | 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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