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Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]            
Net earnings $ 853 $ 1,107 $ 696 $ 640 $ 1,960 $ 1,336
Weighted average common shares outstanding, basic (in shares) 683.6   752.2   694.8 757.9
Effect of dilutive securities (in shares) 2.9   6.1   2.9 6.4
Weighted average common shares outstanding, dilutive (in shares) 686.5   758.3   697.7 764.3
Earnings per basic common share (in usd per share) $ 1.25   $ 0.93   $ 2.82 $ 1.76
Earnings per diluted common share (in usd per share) $ 1.24   $ 0.92   $ 2.81 $ 1.75