Earnings Per Share - Computation of Basic Earnings Per Share, Assuming Dilution (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended							9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020		Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net Earnings	$ 968	$ 1,173	$ 706	$ 736		$ 499	$ 770	$ 2,847	$ 2,005
Denominator:
Average Common Shares Outstanding (in shares)	2,237			2,295	[1]			2,263	2,302	[1]
Other Potentially Dilutive Common Shares (in shares)	5			5	[1]			5	5	[1]
Average Common Shares Outstanding, Assuming Dilution (in shares)	2,242			2,300	[1]			2,268	2,307	[1]
Net Earnings Per Share, Basic (in dollars per share)	$ 0.43			$ 0.32	[1]			$ 1.26	$ 0.87	[1]
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 0.43			$ 0.32	[1]			$ 1.26	$ 0.87	[1]

[1] All prior period share and per share data has been retroactively adjusted to reflect the stock split effective June 28, 2021. Certain prior year data has been reclassified to conform to the current presentation.