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Acquisition and Divestitures (Schedule of Pro Forma Adjustments to Confirm Acquisition) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Total revenues	$ 12,206	$ 4,828	$ 6,220
Net earnings (loss)	$ 2,833	$ (2,671)	$ (353)
Basic net loss per share	$ 4.20	$ (7.12)	$ (0.89)
Devon and WPX Agreement [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Total revenues		$ 7,261
Net earnings (loss)		$ (3,438)
Basic net loss per share		$ (5.16)

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-Subparagraph (SX 210.13-01(a)(4)(ii))
-URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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