Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Numerator:
Net Earnings	$ 2,765	$ 3,331	[1]	$ 3,309	[1]
Dividend Equivalents on Restricted Stock	0	0		(1)
Net Earnings, Attributable to Common Shareholders	$ 2,765	$ 3,331		$ 3,308
Denominator:
Average Common Shares Outstanding (in shares)	766	796	[1]	857	[1]
Other Potentially Dilutive Common Shares (in shares)	2	2		4
Average Common Shares Outstanding, Assuming Dilution (in shares)	768	798	[1]	861	[1]
Earnings Per Share, Basic (in dollars per share)	$ 3.61	$ 4.18	[1]	$ 3.86	[1]
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 3.60	$ 4.17	[1]	$ 3.84	[1]

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