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Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 30, 2016
Numerator:                      
Net Earnings $ 843 $ 894 $ 877 $ 695 $ 4,140 $ 459 $ 510 $ 362 $ 3,309 $ 5,471 $ 1,714
Dividend Equivalents on Restricted Stock                 (1) (1) (1)
Net Earnings, Attributable to Common Shareholders                 $ 3,308 $ 5,470 $ 1,713
Denominator:                      
Average Common Shares Outstanding (in shares)                 857 911 947
Other Potentially Dilutive Common Shares (in shares)                 4 3 1
Average Common Shares Outstanding, Assuming Dilution (in shares)                 861 914 948
Earnings Per Share, Basic (in dollars per share) $ 1.02 $ 1.05 $ 1.02 $ 0.78 $ 4.63 $ 0.51 $ 0.55 $ 0.39 $ 3.86 $ 6.01 $ 1.81
Net Earnings Per Share, Assuming Dilution (in dollars per share) $ 1.01 $ 1.05 $ 1.01 $ 0.78 $ 4.62 $ 0.51 $ 0.55 $ 0.39 $ 3.84 $ 5.99 $ 1.81