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Acquisition and Divestitures (Narrative) (Details) $ / shares in Units, $ in Millions, $ in Billions		3 Months Ended							9 Months Ended		12 Months Ended		48 Months Ended
	Oct. 01, 2020 USD ($) $ / MMBTU $ / bbl	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 CAD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) MMBoe	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2024	Apr. 30, 2020 USD ($)
Business Acquisition [Line Items]
Asset impairment charges		$ 3							$ 182	$ 37
Gain recognized on sale of business, pre tax							$ 35		$ 2	222
Gain on asset dispositions							$ 1			$ 48
Devon and WPX Agreement [Member]
Business Acquisition [Line Items]
Date of Agreement									Sep. 26, 2020
Per share conversion | $ / shares									$ 0.5165
Non Core Assets [Member]
Business Acquisition [Line Items]
Divestitures of property and equipment								$ 300
Gain on asset dispositions								$ 45
Total estimated proved reserves | MMBoe								25
Barnett Shale [Member]
Business Acquisition [Line Items]
Asset impairment charges		3			$ 179	$ 748
BKV [Member] | Barnett Shale [Member]
Business Acquisition [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 impairment charges		$ 3			$ 179	$ 748
BKV [Member] | Barnett Shale [Member] | Scenario Forecast [Member]
Business Acquisition [Line Items]
Contingent earnout payment period													The contingent payment period commences on January 1, 2021 and has a term of four years.
BKV [Member] | Barnett Shale [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Divestitures of property and equipment	$ 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
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member]
Business Acquisition [Line Items]
Proceeds from 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, net of tax											$ 425

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