Property Transactions - Sales Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Proceeds from Divestitures	$ 321	$ 327	$ 1,160
Asset Retirement Obligations Associated with Assets Sold	101	41
Gain on Divestitures	(73)	(36)	(154)
US Onshore Assets Sold [Member]
Business Acquisition [Line Items]
Proceeds from Divestitures	135	150	1,044
Net Book Value of Assets Sold	(150)	(117)	(836)
Goodwill Allocated to Assets Sold	(7)	(8)	(61)
Asset Retirement Obligations Associated with Assets Sold	48	8	20
Other Closing Adjustments	10	3	(13)
Gain on Divestitures	36	36	154
China [Member]
Business Acquisition [Line Items]
Proceeds from Divestitures	186
Net Book Value of Assets Sold	(149)
Other Closing Adjustments	(2)
Gain on Divestitures	$ 35

For the disposal group, obligations not otherwise itemized.

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- Definition

Write-off of the carrying amount (book value) associated with assets sold in the period.

+ References

No definition available.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(2)

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- Definition

Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)

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- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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