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SHORT-TERM BORROWINGS - Narrative (Details) - US commercial paper - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Nov. 30, 2017
Disclosure of detailed information about borrowings [line items] |  |
Maximum aggregate principal allowed to issue | $ 1,500,000,000.0 | $ 1,000,000,000
Minimum |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity term | 1 day |
Maximum |  |
Disclosure of detailed information about borrowings [line items] |  |
Maturity term | 397 days |

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