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Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Millions, $ in Billions			1 Months Ended	3 Months Ended						6 Months Ended	9 Months Ended		12 Months Ended		48 Months Ended
		Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 CAD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) Property	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2024 USD ($)	Apr. 30, 2020 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset impairments				$ 3							$ 182	$ 37
Goodwill			$ 88	88				$ 88			88		$ 88
Cash restricted for discontinued operations			190	190				380	$ 280		190	280	380
Gain recognized on sale of business, pre-tax									35		2	222
Foreign currency translation adjustment	[1]											$ 1,237
Canadian Divestiture [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Estimated cash abandonment charges per quarter											8
Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset impairments				3			$ 179	748
Goodwill			88	88							88
Contingent payments valuation			60
Cash restricted for discontinued operations			20	20							20
Estimated cash abandonment charges per quarter											$ 2
Number of oil and gas leases covering properties | Property											4,500
Expense for litigation claim settlement costs				28
Canadian Business Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Charge on early retirement of debt, cash retirement costs									52
Loss on early retirement of debt, noncash charges									6
Canadian Business Segment [Member] | 4.00% due July 15, 2021 [Member] | Senior Notes [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Long-term debt retired									$ 500
Debt interest rate, stated percentage									4.00%			4.00%
Debt, maturity date									Jul. 15, 2021
Canadian Business Segment [Member] | 3.25% due May 15, 2022 [Member] | Senior Notes [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Long-term debt retired									$ 1,000
Debt interest rate, stated percentage									3.25%			3.25%
Debt, maturity date									May 15, 2022
BKV [Member] | Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash deposit received																$ 170
Contingent earnout payment period											The contingent payment period commences on January 1, 2021 and has a term of four years.
Asset impairments				3			$ 179	$ 748
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash restricted for discontinued operations			$ 170	$ 170							$ 170
Proceeds from the sale of business					$ 2,600	$ 3.4							2,600	$ 3.4
Gain recognized on sale of business, pre-tax													223
Gain recognized on sale of business, after-tax													425
Income taxes paid										$ 175
Foreign currency translation adjustment													$ 1,200
Subsequent Event [Member] | BKV [Member] | Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from the sale of business		$ 490
Contingent earnout payments		$ 260
Henry Hub gas price for contingent earnout payment upside | $ / MMBTU		2.75
WTI oil price for contingent earnout payment upside | $ / bbl		50
Scenario Forecast [Member] | BKV [Member] | Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent earnout payment period															The contingent payment period commences on January 1, 2021 and has a term of four years.
Scenario Forecast [Member] | Maximum [Member] | BKV [Member] | Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Contingent earnout payments															$ 260
[1] In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 17 for additional details.

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