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DEBT - Revolving Credit Facility (Details) - USD ($)			2 Months Ended
	Oct. 31, 2020	Oct. 27, 2020	Dec. 31, 2020	Sep. 30, 2014
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 900,000,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 540,000,000
Line of credit facility, expected reduction of commitments		492,000,000
Line of current borrowing capacity		1,200,000,000	$ 307,000,000
Proceeds from long-term lines of credit		$ 225,000,000
Margin increase, percentage		0.25%
Margin increase, additional increase each subsequent fiscal quarter		0.25%
Line of credit facility, unused capacity, commitment fee percentage		0.50%
Revolving Credit Facility | Line of Credit | First 24 Months
Debt Instrument [Line Items]
Derivative, hedging percent		50.00%
Revolving Credit Facility | Line of Credit | First 24 Months | Crude Oil Hedge Positions
Debt Instrument [Line Items]
Derivative, allocation percent		75.00%
Derivative, period		24 months
Revolving Credit Facility | Line of Credit | Month 25 Through Month 36 | Crude Oil Hedge Positions
Debt Instrument [Line Items]
Derivative, allocation percent		50.00%
Revolving Credit Facility | Line of Credit | 48 Month Period
Debt Instrument [Line Items]
Derivative, period		48 months
Derivative, hedging percent		80.00%
Revolving Credit Facility | Line of Credit | LIBOR
Debt Instrument [Line Items]
Interest rate floor		1.00%
Interest rate added to variable rate basis		1.00%
Revolving Credit Facility | Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Interest rate added to variable rate basis			3.00%
Revolving Credit Facility | Line of Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Interest rate added to variable rate basis			4.00%
Revolving Credit Facility | Line of Credit | Alternative Base Rate
Debt Instrument [Line Items]
Interest rate floor		2.00%
Revolving Credit Facility | Line of Credit | Alternative Base Rate | Minimum
Debt Instrument [Line Items]
Interest rate added to variable rate basis			2.00%
Revolving Credit Facility | Line of Credit | Alternative Base Rate | Maximum
Debt Instrument [Line Items]
Interest rate added to variable rate basis			3.00%
Revolving Credit Facility | Line of Credit | Federal Funds Rate
Debt Instrument [Line Items]
Interest rate added to variable rate basis		0.50%
Revolving Credit Facility | Line of Credit | LIBOR Applicable Margin | Minimum
Debt Instrument [Line Items]
Interest rate added to variable rate basis		3.00%
Revolving Credit Facility | Line of Credit | LIBOR Applicable Margin | Maximum
Debt Instrument [Line Items]
Interest rate added to variable rate basis		4.00%
Revolving Credit Facility | Line of Credit | ABR Applicable Margin | Minimum
Debt Instrument [Line Items]
Interest rate added to variable rate basis		2.00%
Revolving Credit Facility | Line of Credit | ABR Applicable Margin | Maximum
Debt Instrument [Line Items]
Interest rate added to variable rate basis		3.00%
Revolving Credit Facility | Letters of Credit
Debt Instrument [Line Items]
Proceeds from long-term lines of credit	$ 118,000,000	$ 118,000,000
Letters of Credit | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 200,000,000
Letters of credit outstanding amount			$ 134,000,000

X

- Definition

Debt Instrument, Margin Increase, Additional Increase Each Subsequent Fiscal Quarter

+ References

No definition available.

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- Definition

Debt Instrument, Margin Increase, Percentage

+ References

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- Definition

Debt Instrument, Variable Rate, Floor

+ References

No definition available.

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- Definition

Derivative, Allocation Percent

+ References

No definition available.

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- Definition

Derivative, Terms, Hedging Percent

+ References

No definition available.

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- Definition

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- Definition

Line Of Credit Facility, Expected Reduction Of Commitments

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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