Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details)

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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Intangible Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 220 $ 220
Finite-Lived Intangible Assets, Accumulated Amortization (35) (32)
Finite-Lived Intangible Assets, Net 185 188
Above-market supply contracts, Gross Amount (71) (71)
Above-market supply contracts, Accumulated Amortization 8 7
Above-market supply contracts, Net (63) (64)
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 77 77
Finite-Lived Intangible Assets, Accumulated Amortization (5) (3)
Finite-Lived Intangible Assets, Net 72 74
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 60 60
Finite-Lived Intangible Assets, Accumulated Amortization (4) (3)
Finite-Lived Intangible Assets, Net 56 57
Trade names and trademarks    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 11 11
Finite-Lived Intangible Assets, Accumulated Amortization (1) (1)
Finite-Lived Intangible Assets, Net 10 10
Mining permits    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 72 72
Finite-Lived Intangible Assets, Accumulated Amortization (25) (25)
Finite-Lived Intangible Assets, Net $ 47 $ 47