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SIGNIFICANT ACCOUNTING POLICIES - Adoption of New Accounting Standards (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-use asset | $ 271 | $ 302 |
Lease liability | 293 | 302 |
Other non-current liabilities adjustment, upon adoption of ASU | $ (851) |  | $ (581)
Restatement Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-use asset |  | (20) |
Other non-current liabilities adjustment, upon adoption of ASU |  | $ 20 |

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