Income tax examination year one under examination.

No definition available.

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- Details

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ 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)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

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- Definition

Tax year being audited in the income tax examination, in CCYY format.

+ References

No definition available.

+ Details

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- Definition

The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 4(ii)

-Article 4

+ Details

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended				9 Months Ended	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 United States [Member]	Sep. 30, 2013 Kenya [Member]	Sep. 30, 2013 Argentina [Member]	Mar. 31, 2013 Argentina [Member]	Sep. 30, 2013 Argentina [Member]	Sep. 30, 2013 Canada [Member]	Sep. 30, 2012 Canada [Member]	Jun. 30, 2012 Canada [Member]	Mar. 31, 2012 Canada [Member]	Sep. 30, 2013 Canada [Member]
Income Tax [Line Items]
Income tax impact		$ 552		$ 116	$ 65			$ 721	$ 641	$ 521
Asset impairment charges			75
Valuation Allowance				$ 48		$ 66	$ 10				$ 38
Year under audit, year one	2011
Year under audit	2012