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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)