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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Cash (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash
Unrestricted cash	$ 28	$ 14
Cash restricted under our joint venture agreements		$ 3

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Unrestricted Cash

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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