Amount classified as assets attributable to disposal group held for sale or disposed of.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

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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 FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Section S99

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869

Reference 2: 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

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Business Segment Information - Financial Segment Information (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
United States [Member]
Segment Reporting Information [Line Items]
Write-down of the carrying value of Oil and Gas properties	$ 4,300.0	$ 5,300.0		$ 9,600.0
Canada [Member]
Segment Reporting Information [Line Items]
Write-down of the carrying value of Oil and Gas properties	835.0	1,400.0		2,200.0
North Sea [Member]
Segment Reporting Information [Line Items]
Write-down of the carrying value of Oil and Gas properties	$ 663.0	$ 632.0	$ 203.0	$ 1,300.0	$ 203.0
Australia [Member]
Segment Reporting Information [Line Items]
Total Assets			$ 8.3		$ 8.3