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		(7)	(60)	(2,089)
Net earnings	$ 3,232			3,232
Dividends declared				(489)
Stock compensation		0	2	8
Other comprehensive loss, net of tax	(4)				(4)
End of period at Jun. 30, 2021	$ 11,172	160	0	11,144	(132)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 3.02
Beginning of period at Mar. 31, 2021		161	8	10,487	(131)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(1)	(21)	(134)
Net earnings	$ 1,037
Dividends declared				(254)
Stock compensation		0	13	8
Other comprehensive loss, net of tax	(1)				(1)
End of period at Jun. 30, 2021	$ 11,172	160	0	11,144	(132)
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		(2)	0	(638)
Net earnings	1,901			1,901
Dividends declared				(516)
Stock compensation		1	0	(5)
Other comprehensive loss, net of tax	(16)				(16)
End of period at Jun. 30, 2022	$ 13,651	155	0	13,655	(159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 3.30
Beginning of period at Mar. 31, 2022		156	0	13,277	(146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(1)	0	(323)
Net earnings	$ 946
Dividends declared				(270)
Stock compensation		0	0	25
Other comprehensive loss, net of tax	(13)				(13)
End of period at Jun. 30, 2022	$ 13,651	$ 155	$ 0	$ 13,655	$ (159)