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Net Earnings Per Share (Net Earnings (Loss) Per Share Computations from Continuing Operations) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net earnings:        
Net earnings $ 1,893 $ 838 $ 4,814 $ 1,307
Attributable to participating securities (17) (6) (50) (11)
Basic and diluted earnings $ 1,876 $ 832 $ 4,764 $ 1,296
Common shares:        
Common shares outstanding - total 655 677 658 670
Attributable to participating securities (6) (6) (6) (6)
Common shares outstanding - basic 649 671 652 664
Dilutive effect of potential common shares issuable 2 2 2 2
Common shares outstanding - diluted 651 673 654 666
Net Earnings Per Share Basic And Diluted        
Basic $ 2.89 $ 1.24 $ 7.30 $ 1.95
Diluted $ 2.88 $ 1.24 $ 7.28 $ 1.95