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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net Earnings	$ 870	$ 834	$ 877	$ 695	$ 1,704	$ 1,572
Denominator:
Average Common Shares Outstanding (in shares)	805		864		810	875
Other Potentially Dilutive Common Shares (in shares)	2		4		2	3
Average Common Shares Outstanding, Assuming Dilution (in shares)	807		868		812	878
Net Earnings Per Share, Basic (in dollars per share)	$ 1.08		$ 1.02		$ 2.10	$ 1.80
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 1.08		$ 1.01		$ 2.10	$ 1.79