Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common stock	Paid-in capital	Retained earnings	Accumulated other comprehensive loss
Beginning of period at Dec. 31, 2020		$ 167	$ 58	$ 10,482	$ (128)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(8)	(60)	(2,676)
Net earnings	$ 4,295			4,295
Dividends declared				(741)
Stock compensation		0	2	38
Other comprehensive loss, net of tax	(12)				(12)
End of period at Sep. 30, 2021	$ 11,417	159	0	11,398	(140)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 4.59
Beginning of period at Jun. 30, 2021		160	0	11,144	(132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(1)	0	(587)
Net earnings	$ 1,063			1,063
Dividends declared				(252)
Stock compensation		0	0	30
Other comprehensive loss, net of tax	(8)				(8)
End of period at Sep. 30, 2021	$ 11,417	159	0	11,398	(140)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.57
Beginning of period at Dec. 31, 2021	$ 12,926	156	0	12,913	(143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(3)	0	(1,012)
Net earnings	2,816			2,816
Dividends declared				(785)
Stock compensation		1	0	23
Other comprehensive loss, net of tax	(23)				(23)
End of period at Sep. 30, 2022	$ 13,943	154	0	13,955	(166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 5.03
Beginning of period at Jun. 30, 2022		155	0	13,655	(159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(1)	0	(374)
Net earnings	$ 915			915
Dividends declared				(269)
Stock compensation		0	0	28
Other comprehensive loss, net of tax	(7)				(7)
End of period at Sep. 30, 2022	$ 13,943	$ 154	$ 0	$ 13,955	$ (166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.73