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Assets Held for Sale or Sold (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended
	Apr. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019
Long Lived Assets Held For Sale [Line Items]
Income (Loss) from Equity Method Investments		$ 173.0		$ 265.0		$ 361.0	$ 473.0
Golden Pass [Member] | Lower 48 Segment | Operating Segments [Member]
Long Lived Assets Held For Sale [Line Items]
Equity Method Investment, Ownership Percentage								12.40%
Income (Loss) from Equity Method Investments			$ (60.0)
Greater Sunrise Fields [Member] | Asia Pacific and Middle East [Member] | Operating Segments [Member]
Long Lived Assets Held For Sale [Line Items]
Proceeds from asset dispositions		$ 350.0
Percent of Working Interest Sold		30.00%				30.00%
Gain Loss On Sale Of Oil And Gas Property After Tax		$ 52.0
U.K. Subsidiaries [Member] | Europe and North Africa Segment [Member] | Operating Segments [Member]
Long Lived Assets Held For Sale [Line Items]
Net carrying value		800.0				$ 800.0
Amount of PP&E in carrying value of assets		1,600.0				1,600.0
Working Capital in net carrying value		200.0				200.0
Income Tax Reconciliation Recovery of outside basis		(234.0)
Pretax operating Income (Loss)						293.0	$ 432.0
U.K. Subsidiaries [Member] | Europe and North Africa Segment [Member] | Operating Segments [Member] | Scenario Plan [Member]
Long Lived Assets Held For Sale [Line Items]
Proceeds from asset dispositions	$ 2,675.0
Gain Loss On Sale Of Oil And Gas Property After Tax					$ 2,000.0
Before-tax gain (loss) on disposition					$ 2,000.0
U.K. Subsidiaries [Member] | Europe and North Africa Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member]
Long Lived Assets Held For Sale [Line Items]
Asset retirement obligation at disposal		1,900.0				$ 1,900.0
Foster Creek Christina Lake and western Canada gas properties [Member] | Canada Segment [Member] | Operating Segments [Member]
Long Lived Assets Held For Sale [Line Items]
Before-tax gain (loss) on disposition		$ 56.0	$ 19.0	$ 50.0
Cenovus Contingent Payment Trigger						Consideration for the transaction included a five-year uncapped contingent payment. The contingent payment, calculated on a quarterly basis, is $6 million CAD for every $1 CAD by which the WCS quarterly average crude price exceeds $52 CAD per barrel.

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