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, 2020	Mar. 31, 2020	Jun. 30, 2019		Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net Earnings	$ 499	$ 770	$ 870	[1]	$ 834	$ 1,269	$ 1,704	[1]
Denominator:
Average Common Shares Outstanding (in shares)	766		805	[1]		769	810	[1]
Other Potentially Dilutive Common Shares (in shares)	1		2			1	2
Average Common Shares Outstanding, Assuming Dilution (in shares)	767		807	[1]		770	812	[1]
Net Earnings Per Share, Basic (in dollars per share)	$ 0.65		$ 1.08	[1]		$ 1.65	$ 2.10	[1]
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 0.65		$ 1.08	[1]		$ 1.65	$ 2.10	[1]

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