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		(6)	(39)	(1,955)
Net earnings	$ 2,195			2,195
Dividends declared				(235)
Stock compensation		0	(11)	0
Other comprehensive loss, net of tax	(3)				(3)
End of period at Mar. 31, 2021	$ 10,525	161	8	10,487	(131)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.45
Beginning of period at Dec. 31, 2021	$ 12,926	156	0	12,913	(143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(1)	0	(315)
Net earnings	955			955
Dividends declared				(246)
Stock compensation		1	0	(30)
Other comprehensive loss, net of tax	(3)				(3)
End of period at Mar. 31, 2022	$ 13,287	$ 156	$ 0	$ 13,277	$ (146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.57