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CONTRACTUAL COMMITMENTS (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Contractual Commitments [Abstract] |  |
Contractual commitments | $ 1,448 | $ 1,201
Asset management fee as percent per quarter | 0.3125% |
Asset management fee, percent | 1.25% |
Less than 1 year |  |
Disclosure of contingent liabilities [line items] |  |
Contractual capital commitments, maturity, percent | 32.00% |
1 to 5 years |  |
Disclosure of contingent liabilities [line items] |  |
Contractual capital commitments, maturity, percent | 42.00% |
Thereafter |  |
Disclosure of contingent liabilities [line items] |  |
Contractual capital commitments, maturity, percent | 26.00% |

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