Earnings Per Share - Computation of Basic Earnings Per Share, Assuming Dilution (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net Earnings	$ 877	$ 510	$ 1,572	$ 872
Denominator:
Average Common Shares Outstanding (in shares)	864	920	875	923
Other Potentially Dilutive Common Shares (in shares)	4	4	3	3
Average Common Shares Outstanding, Assuming Dilution (in shares)	868	924	878	926
Net Earnings Per Share, Basic (in dollars per share)	$ 1.02	$ 0.55	$ 1.80	$ 0.94
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 1.01	$ 0.55	$ 1.79	$ 0.94