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, 2021	Mar. 31, 2020
Numerator:
Net Earnings	$ 706	$ 770
Denominator:
Average Common Shares Outstanding (in shares)	761	772
Other Potentially Dilutive Common Shares (in shares)	1	1
Average Common Shares Outstanding, Assuming Dilution (in shares)	762	773
Net Earnings Per Share, Basic (in dollars per share)	$ 0.93	$ 1.00
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 0.93	$ 1.00