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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net earnings available to common shareholders - basic $ 910 $ 1,876 $ 2,595 $ 4,764
Net earnings available to common shareholders - diluted $ 910 $ 1,876 $ 2,595 $ 4,764
Common shares:        
Average common shares outstanding - basic 637 649 640 652
Dilutive effect of potential common shares issuable 2 2 3 2
Average common shares outstanding - diluted 639 651 643 654
Net earnings per share available to common shareholders:        
Basic $ 1.43 $ 2.89 $ 4.05 $ 7.3
Diluted $ 1.42 $ 2.88 $ 4.03 $ 7.28