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Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Millions, $ in Billions				3 Months Ended				6 Months Ended
		Jun. 27, 2019 USD ($)	Jun. 27, 2019 CAD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) MMcf	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of aggregate ownership interests, before-tax					$ 189			$ 189
Foreign currency translation adjustment	[1]				1,237			1,237
Cash restricted for discontinued operations					370			370
Loss on early retirement of debt, cash retirement costs									$ 304
Assets related to divestiture					230			230		$ 4,269
Liabilities related to divestiture					$ 2,083			$ 2,083		2,623
Non-Core Upstream Assets [Member] | Permian Basin [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Assets related to divestiture										197
Liabilities related to divestiture										$ 69
Senior Notes [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on early retirement of debt, cash retirement costs							$ 304
Loss on early retirement of debt, noncash charges							$ 8
4.00% due July 15, 2021 [Member] | Senior Notes [Member] | Scenario Forecast [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%
Debt, maturity date				Jul. 15, 2021
3.25% due May 15, 2022 [Member] | Senior Notes [Member] | Scenario Forecast [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%
Debt, maturity date				May 15, 2022
Canadian​ Divestiture [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Restructuring costs and asset impairment charges		$ 273
Estimated cash abandonment charges per quarter		6
Canadian Business Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred tax asset		34
Canadian Business Segment [Member] | Scenario Forecast [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss 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] | Scenario Forecast [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%
Debt, maturity date				Jul. 15, 2021
Canadian Business Segment [Member] | 3.25% due May 15, 2022 [Member] | Senior Notes [Member] | Scenario Forecast [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%
Debt, maturity date				May 15, 2022
Canadian Business Segment [Member] | Canadian​ Divestiture [Member] | Firm Transportation Agreement Abandonment Charge [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Restructuring costs and asset impairment charges		154
Canadian Business Segment [Member] | Canadian​ Divestiture [Member] | Office Lease Abandonment and Related Asset Impairment Charges [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Restructuring costs and asset impairment charges		55
Canadian Business Segment [Member] | Canadian​ Divestiture [Member] | Employee Related Costs [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Restructuring costs and asset impairment charges		64
Expense associated with accelerated awards		$ 40
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Effective close date of divestiture		Jun. 27, 2019	Jun. 27, 2019
Proceeds from sale of aggregate ownership interests		$ 2,600	$ 3.4
Gain on sale of aggregate ownership interests, before-tax		189
Gain on sale of aggregate ownership interests, after-tax		460
Cash income taxes		110
Foreign currency translation adjustment		1,200
Cash restricted for discontinued operations		370
Restructuring costs reimbursed		$ 50
EnLink and General Partner [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Effective close date of divestiture								Jul. 18, 2018
Proceeds from sale of aggregate ownership interests						$ 3,125
Gain on sale of aggregate ownership interests, before-tax						2,600
Gain on sale of aggregate ownership interests, after-tax						2,200
Cash income taxes						$ 12
Net cash outflows								$ 280
EnLink and General Partner [Member] | Chisholm Gathering and Processing Contract [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gathering and processing minimum volume commitments period end								early 2021
EnLink and General Partner [Member] | Bridgeport and Cana Gathering and Processing Contracts [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Commitment Termination Date								Dec. 31, 2029
EnLink and General Partner [Member] | Minimum [Member] | Chisholm Gathering and Processing Contract [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Minimum gathering volume commitment | MMcf								77
Minimum processing volume commitment | MMcf								77
EnLink and General Partner [Member] | Maximum [Member] | Chisholm Gathering and Processing Contract [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Minimum gathering volume commitment | MMcf								128
Minimum processing volume commitment | MMcf								128
[1] In conjunction with the sale of all of its Canadian operating assets, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 18 for additional details.

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