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Net Earnings (Loss) Per Share from Continuing Operations (Net Earnings (Loss) Per Share Computations from Continuing Operations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net earnings (loss) from continuing operations:
Net earnings (loss) from continuing operations	$ 256	$ (679)	$ 469	$ (2,370)
Attributable to participating securities	(3)		(5)	(1)
Basic and diluted earnings (loss) from continuing operations	$ 253	$ (679)	$ 464	$ (2,371)
Common shares:
Common shares outstanding - total	677	383	666	383
Attributable to participating securities	(6)	(6)	(6)	(6)
Common shares outstanding - basic	671	377	660	377
Dilutive effect of potential common shares issuable	2		2
Common shares outstanding - diluted	673	377	662	377
Net earnings (loss) per share from continuing operations:
Basic	$ 0.38	$ (1.80)	$ 0.70	$ (6.29)
Diluted	$ 0.38	$ (1.80)	$ 0.70	$ (6.29)

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