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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Capitalized Costs) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) $ / Boe
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Properties subject to amortization			$ 27,507
Accumulated amortizationa			(27,433)
Total			74
Impairment of Oil and Gas Properties	$ 0	$ 0	$ 4,317
Average Depletion Depreciation and Amortization Expense Per Unit of Production | $ / Boe			17.58

X

- Definition

The average DD&A expense computed on the basis of physical units, with oil and gas converted to a common unit of measure on the basis of their approximate relative energy content.

+ References

No definition available.

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- Definition

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447

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- Definition

The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 235
-Section 50
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- Definition

Net amount of capitalized costs relating to oil and gas producing activities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
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