Net Earnings Per Share (Net Earnings (Loss) Per Share Computations from Continuing Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net earnings:
Net earnings	$ 989	$ 213
Attributable to participating securities	16	(2)
Basic and diluted earnings	$ 973	$ 211
Common shares:
Common shares outstanding - total	663,000,000	654,000,000
Attributable to participating securities	(7,000,000)	(5,000,000)
Common shares outstanding - basic	656,000,000	649,000,000
Dilutive effect of potential common shares issuable	2,000,000	2,000,000
Common shares outstanding - diluted	658,000,000	651,000,000
Net earnings per share:
Basic	$ 1.48	$ 0.33
Diluted	$ 1.48	$ 0.32