Earnings Per Share - Computation of Basic Earnings Per Share, Assuming Dilution (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net Earnings	$ 770	$ 834	[1]
Denominator:
Average Common Shares Outstanding (in shares)	772	814	[1]
Other Potentially Dilutive Common Shares (in shares)	1	3
Average Common Shares Outstanding, Assuming Dilution (in shares)	773	817	[1]
Net Earnings Per Share, Basic (in dollars per share)	$ 1.00	$ 1.02	[1]
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 1.00	$ 1.02	[1]

[1] Certain prior year data has been reclassified to conform to the current presentation.