Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Numerator:
Net Earnings	$ 934	$ 968	$ 1,173	$ 706	$ 760	$ 736	$ 499	$ 770	$ 3,781	$ 2,765		$ 3,331
Dividend Equivalents on Restricted Stock									0	0		0
Net Earnings, Attributable to Common Shareholders									$ 3,781	$ 2,765		$ 3,331
Denominator:
Average Common Shares Outstanding (in shares)									2,250	2,300	[1]	2,389	[1]
Other Potentially Dilutive Common Shares (in shares)									5	5	[1]	6	[1]
Average Common Shares Outstanding, Assuming Dilution (in shares)									2,255	2,305	[1]	2,395	[1]
Net Earnings Per Share, Basic (in dollars per share)	$ 0.42	$ 0.43	$ 0.52	$ 0.31	$ 0.33	$ 0.32	$ 0.22	$ 0.33	$ 1.68	$ 1.20	[1]	$ 1.39	[1]
Net Earnings Per Share, Assuming Dilution (in dollars per share)	$ 0.42	$ 0.43	$ 0.52	$ 0.31	$ 0.33	$ 0.32	$ 0.22	$ 0.33	$ 1.68	$ 1.20	[1]	$ 1.39	[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.