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DERIVATIVES - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Derivatives
Net derivative gain (loss) from commodity contracts		$ 79,000,000	$ (89,000,000)
Crude Oil Hedge Positions
Derivatives
Net derivative gain (loss) from commodity contracts	$ 63,000,000
Interest-rate Contract
Derivatives
Derivative, amount of hedged item	$ 1,300,000,000	1,300,000,000
Gain (loss) from interest-rate risk		$ 0	$ (3,000,000)
Interest-rate Contract | One month LIBOR
Derivatives
Interest rate to be in place to receive payment	2.75%	2.75%

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- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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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

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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