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, 2019		$ 168	$ 0	$ 8,748	$ (97)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased		(1)	0	(348)
Net earnings	$ 868			868
Dividends declared				(223)
Stock compensation			0	(45)
Other				11
Other comprehensive loss, net of tax	(19)				(19)
End of period at Mar. 31, 2020	$ 9,062	167	0	9,011	(116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends declared per share	$ 1.32
Beginning of period at Dec. 31, 2020	$ 10,579	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			(11)	0
Other				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