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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Total revenues	$ 2,417	$ 394	$ 4,467	$ 2,481
Net earnings (loss)	$ 261	$ (668)	$ 477	$ (2,483)
Basic net loss per share	$ 0.38	$ (1.78)	$ 0.70	$ (6.60)
Devon and WPX Agreement [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Total revenues		$ 427		$ 3,912
Net earnings (loss)		$ (1,102)		$ (2,966)
Basic net loss per share		$ (1.65)		$ (4.45)

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