Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash Equivalents and Restricted Cash (Details)

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Feb. 12, 2021
Cripple Creek Project    
Basis Of Presentation [Line Items]    
Restricted cash account $ 180 $ 180