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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | Jan. 01, 2018 | Dec. 31, 2017
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Prospective Adoption of New Accounting Pronouncements [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 16
Assets [member] |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 25 |
Liabilities [member] |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 9 |
Equity [member] |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 16 |

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