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Discontinued Operations and Assets Held for Sale (Narrative) (Details) $ in Millions, $ in Billions	1 Months Ended	3 Months Ended				12 Months Ended
	Dec. 31, 2020 USD ($) $ / bbl $ / Mcf	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Apr. 30, 2020 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash restricted for discontinued operations		$ 200	$ 380			$ 380
Asset impairments		179
Goodwill		88	88			88
Gain recognized on sale of business, pre-tax					$ (1)
Canadian Divestiture [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Estimated cash abandonment charges per quarter		6
Barnett Shale [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash restricted for discontinued operations		25
Estimated cash abandonment charges per quarter		2
Asset impairments		179	$ 748
Goodwill		88
Contingent payments valuation		$ 41
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%
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%
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]
Contingent earnout payment period		The contingent payment period commences on January 1, 2021 and has a term of four years.
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		$ 175
Effective close date of divestiture		Jun. 27, 2019
Proceeds from the sale of business						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		$ 150
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]
Cash deposit received								$ 170
Scenario Forecast [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	$ 570
Henry Hub gas price for contingent earnout payment upside \| $ / Mcf	2.75
WTI oil price for contingent earnout payment upside \| $ / bbl	50
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