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Maximum percentage of production available to contract partners.

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Oil And Gas Pricing Formula Sliding Scale

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Revenue From Non-Customer

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Schedule Of Significant Accounting Policies [Line Items]

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UK Petroleum Revenue Tax Rate

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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 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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Amount, excluding 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, 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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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail)			3 Months Ended		6 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail)	Jan. 01, 2016	Dec. 31, 2015	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / MMBTU	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule Of Significant Accounting Policies [Line Items]
Asset impairments					$ 0
Asset impairment charges and unproved oil and gas leasehold impairments				$ 0		$ 8,000,000
U.K. Petroleum Revenue Tax rate	0.00%	35.00%
Cost of purchased oil and gas			$ 82,000,000	48,000,000	$ 168,000,000	105,000,000
Maximum percentage of production available to contract partners					40.00%
Revenue from Contract with Customer, Excluding Assessed Tax			1,900,000,000		$ 3,500,000,000
Revenue from contract with customers			1,936,000,000	1,346,000,000	3,669,000,000	2,858,000,000
Revenue from non-customer			181,000,000		336,000,000
Receivables from contracts with customer, net			1,300,000,000		1,300,000,000		$ 1,100,000,000
Oil and Gas Properties, Proved
Schedule Of Significant Accounting Policies [Line Items]
Asset impairments			0	0	0	0
Oil and Gas Properties, Unproved
Schedule Of Significant Accounting Policies [Line Items]
Asset impairments			21,000,000	$ 39,000,000	$ 37,000,000	$ 54,000,000
Dated Brent \| Crude Oil \| Minimum
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas pricing formula sliding scale \| $ / MMBTU					1.50
Dated Brent \| Crude Oil \| Maximum
Schedule Of Significant Accounting Policies [Line Items]
Oil and gas pricing formula sliding scale \| $ / MMBTU					2.65
Oil and gas purchased
Schedule Of Significant Accounting Policies [Line Items]
Revenue from contract with customers			$ 98,000,000		$ 202,000,000