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Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Examination [Line Items]
Canada disposition	$ 0	$ (8)	$ 0	$ (1,176)
Recovery of outside basis	(16)	(118)	(19)	(957)
Adjustment to tax reserves, amount	(3)	(17)	2	764
Oil and gas
Income Tax Examination [Line Items]
Recovery of outside basis		$ (114)		$ (114)
Conoco Phillips Vs Petroleos de Venezuela SA [Member]
Income Tax Examination [Line Items]
Total Tax Benefit Related to Settlement	$ 53
Canada Revenue Agency [Member] | Foster Creek Christina Lake (FCCL) and western Canada gas properties [Member]
Income Tax Examination [Line Items]
Canada disposition			(1,176)
Recovery of outside basis			(822)
Adjustment to tax reserves, amount			$ 822

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the reserve for deferred tax assets.

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- Definition

Tax benefit recognized in the period related to unrecognized deferred tax assets associated with income related to a specific event.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to disposition of asset. Includes, but is not limited to, intra-entity transfer of asset other than inventory.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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