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, 2021	Mar. 31, 2021	Jun. 30, 2020		Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net Earnings	$ 1,173	$ 706	$ 499		$ 770	$ 1,879	$ 1,269
Denominator:
Average Common Shares Outstanding (in shares)	2,270		2,297	[1]		2,276	2,306	[1]
Other Potentially Dilutive Common Shares (in shares)	5		4	[1]		5	5	[1]
Average Common Shares Outstanding, Assuming Dilution (in shares)	2,275		2,301	[1]		2,281	2,311	[1]
Net Earnings Per Share, Basic (in dollars per share)	$ 0.52		$ 0.22	[1]		$ 0.83	$ 0.55	[1]
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 0.52		$ 0.22	[1]		$ 0.82	$ 0.55	[1]

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