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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net earnings:        
Net earnings $ 690 $ 1,932 $ 1,685 $ 2,921
Attributable to participating securities (3) (17) (11) (33)
Basic and diluted earnings $ 687 $ 1,915 $ 1,674 $ 2,888
Common shares:        
Common shares outstanding - total 642 658 646 661
Attributable to participating securities (4) (6) (5) (7)
Common shares outstanding - basic 638 652 641 654
Dilutive effect of potential common shares issuable 1 2 2 2
Common shares outstanding - diluted 639 654 643 656
Net earnings per share:        
Basic $ 1.08 $ 2.94 $ 2.61 $ 4.42
Diluted $ 1.07 $ 2.93 $ 2.6 $ 4.4