SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Restricted cash	$ 5,000,000	$ 0
Allowance for doubtful accounts	2,000,000	2,000,000
Impairment of long-lived assets	0	0	$ 0
Interest capitalized	66,000,000	32,000,000	22,000,000
Equity method investment impairment	0	0	0
Unrecognized tax benefits	7,000,000	7,000,000	0
Margin tax expense	0	0	0
Interest or penalties associated with uncertain tax positions	0	0	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs	36,000,000	28,000,000
Debt issuance costs, accumulated amortization	15,000,000	9,000,000
Senior Notes
Debt Instrument [Line Items]
Debt issuance costs	24,000,000	32,000,000
Debt issuance costs, accumulated amortization	$ 14,000,000	$ 15,000,000

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Amount of accumulated amortization of debt issuance costs.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. 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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Amount of unrecognized tax benefits.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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