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Schedule Of Significant Accounting Policies [Line Items]

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- Definition

Fair value portion of assets classified as held for sale.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of cash outflow for variable lease payment excluded from lease liability.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Schedule Of Significant Accounting Policies [Line Items]
Impairments	$ 240,000,000	$ 0	$ 240,000,000	$ 0
Assets held-for-sale, fair value	379,000,000		379,000,000
Oil and gas production revenues	1,598,000,000	1,936,000,000	3,252,000,000	3,669,000,000
Cost of oil and gas purchased	76,000,000	82,000,000	164,000,000	168,000,000
Receivables from contracts with customer, net	936,000,000		936,000,000			$ 1,000,000,000.0
Fixed operating lease expenses	59,000,000		114,000,000
Other noncurrent liabilities	(514,000,000)		(514,000,000)			(219,000,000)
Long-term debt	8,157,000,000		8,157,000,000			$ 8,093,000,000
Variable lease payment	24,000,000		41,000,000
Accounting Standards Update 2016-02
Schedule Of Significant Accounting Policies [Line Items]
Other noncurrent liabilities					$ 39,000,000
Long-term debt					$ 39,000,000
Oil and Gas, Purchased
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas production revenues	18,000,000	98,000,000	42,000,000	202,000,000
Cost of oil and gas purchased	15,000,000	95,000,000	37,000,000	199,000,000
Oil and Gas Properties, Proved
Schedule Of Significant Accounting Policies [Line Items]
Impairments	86,000,000	0	86,000,000	0
Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Impairments	188,000,000	$ 21,000,000	211,000,000	$ 37,000,000
Other Working Capital
Schedule Of Significant Accounting Policies [Line Items]
Impairments	5,000,000
Assets held under Finance Leases
Schedule Of Significant Accounting Policies [Line Items]
Depreciation	2,000,000		4,000,000
Interest costs	$ 1,000,000		$ 1,000,000
Altus Midstream Company
Schedule Of Significant Accounting Policies [Line Items]
Ownership percentage by noncontrolling owners	21.00%		21.00%
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Percentage of voting interests acquired	50.00%		50.00%
Maximum
Schedule Of Significant Accounting Policies [Line Items]
Percentage of voting interests acquired	50.00%		50.00%
Oklahoma and Texas \| Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Impairments	$ 149,000,000