Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

+ Details

Name:	us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_FairValueMeasurementsNonrecurringValueMeasurementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_ImpairmentOfOilAndGasProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

+ References

+ Details

Name:	us-gaap_TangibleAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	12 Months Ended
FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Midstream
Fair Values - Nonrecurring
Pre-tax impairment charges			$ 814
Proved and unproved non-core Permian acreages
Fair Values - Nonrecurring
Pre-tax impairment charges	$ 397
Proved gas and oil properties
Fair Values - Nonrecurring
Pre-tax impairment charges		$ 15	6,500
Williston Basin
Fair Values - Nonrecurring
Pre-tax impairment charges			763
Piceance basin
Fair Values - Nonrecurring
Pre-tax impairment charges			460
South Texas
Fair Values - Nonrecurring
Pre-tax impairment charges			554
Oman
Fair Values - Nonrecurring
Pre-tax impairment charges			1,800
Iraq and Libya
Fair Values - Nonrecurring
Pre-tax impairment charges			1,300
Qatar
Fair Values - Nonrecurring
Pre-tax impairment charges			1,000
Colombia and Bolivia
Fair Values - Nonrecurring
Pre-tax impairment charges			550
Impaired proved oil and gas assets - international
Fair Values - Nonrecurring
Pre-tax impairment charges			4,700
Recurring \| Fair Value \| Accrued liabilities
Liabilities:
Embedded derivative	39	43
Recurring \| Fair Value \| Deferred credits and liabilities
Liabilities:
Embedded derivative	147	178
Recurring \| Fair Value \| Level 2 \| Accrued liabilities
Liabilities:
Embedded derivative	39	43
Recurring \| Fair Value \| Level 2 \| Deferred credits and liabilities
Liabilities:
Embedded derivative	$ 147	$ 178
Non recurring \| Low end of range
Fair Values - Nonrecurring
Risk adjusted discount rate	8.00%
Non recurring \| High end of range
Fair Values - Nonrecurring
Risk adjusted discount rate	20.00%
Operating segments \| Chemical
Fair Values - Nonrecurring
Impairment charges			$ 121