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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Adoption of ASU 2016-02 (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 30, 2019
--- | --- | --- | ---
Assets |  |  |
Operating lease right-of-use assets | $ 51 | $ 55 | $ 0
Liabilities |  |  |
Operating lease liabilities | 11 | 17 | 0
Operating lease liabilities, noncurrent | 49 | 48 | 10
Equity |  |  |
Accumulated deficit | $ (144) | (219) | (219)
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Assets |  |  |
Operating lease right-of-use assets |  | 55 |
Liabilities |  |  |
Operating lease liabilities |  | 17 |
Operating lease liabilities, noncurrent |  | 38 |
Equity |  |  |
Accumulated deficit |  | $ 0 |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Assets |  |  |
Operating lease right-of-use assets |  |  | 55
Liabilities |  |  |
Operating lease liabilities |  |  | 17
Operating lease liabilities, noncurrent |  |  | 48
Equity |  |  |
Accumulated deficit |  |  | $ (219)

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