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Acquisition and Divestitures (Schedule of Pro Forma Adjustments to Confirm Acquisition) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Total revenues	$ 3,466	$ 1,067	$ 7,933	$ 3,548
Net earnings (loss)	$ 844	$ (90)	$ 1,321	$ (2,573)
Basic net loss per share	$ 1.24	$ (0.25)	$ 1.95	$ (6.85)
Devon and WPX Agreement [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Total revenues	$ 1,540		$ 5,452
Net earnings (loss)	$ (281)		$ (3,247)
Basic net loss per share	$ (0.42)		$ (4.87)

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-Name Accounting Standards Codification
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-Section S99
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