Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Total	Common Shares	Common Stock and Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance, shares at Dec. 31, 2020			86,345,246
Beginning balance at Dec. 31, 2020		$ 6,789		$ 1,367	$ 4,149	$ 1,273
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 1,995	1,995			1,995
Other comprehensive income (loss)	(1,154)	(1,154)				(1,154)
Dividends		(2,382)			(2,382)
Shares issued:
Exercise of stock options, shares			1,208,964
Exercise of stock options		59		59
Restricted stock awards, shares			207,020
Restricted stock awards		0		0
Other benefit plans, shares			81,286
Other benefit plans		10		10
Dividend reinvestment plan, shares			69,095
Dividend reinvestment plan		8		8
Stock-based compensation expense		16		16
Shares acquired and retired, shares			(2,777,684)
Shares acquired and retired		(319)		(44)	(275)
Shares exchanged — benefit plans, shares			(92,209)
Shares exchanged — benefit plans		(10)		(1)	(9)
Forfeitures of restricted stock, shares			(120,753)
Ending balance, shares at Dec. 31, 2021			84,920,965
Ending balance at Dec. 31, 2021		5,012		1,415	3,478	119
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	898	898			898
Other comprehensive income (loss)	$ (662)	(662)				(662)
Dividends		(1,217)			(1,217)
Shares issued:
Exercise of stock options, shares			182,054
Exercise of stock options		7		7
Restricted stock awards, shares			151,080
Restricted stock awards		0		0
Other benefit plans, shares			78,460
Other benefit plans		10		10
Dividend reinvestment plan, shares			33,794
Dividend reinvestment plan		4		4
Stock-based compensation expense		19		19
Shares acquired and retired, shares			(89,368)
Shares acquired and retired		(11)		(1)	(10)
Shares exchanged — benefit plans, shares			(57,420)
Shares exchanged — benefit plans		(8)		(1)	(7)
Forfeitures of restricted stock, shares			(15,559)
Ending balance, shares at Dec. 31, 2022	85,204,006		85,204,006
Ending balance at Dec. 31, 2022	$ 4,052	4,052		1,453	3,142	(543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	852	852			852
Other comprehensive income (loss)	$ 224	224				224
Dividends		(687)			(687)
Shares issued:
Exercise of stock options, shares	96,953		96,953
Exercise of stock options		4		4
Restricted stock awards, shares			165,513
Restricted stock awards		0		0
Other benefit plans, shares			104,207
Other benefit plans		13		13
Dividend reinvestment plan, shares			20,614
Dividend reinvestment plan		3		3
Stock-based compensation expense		18		18
Shares acquired and retired, shares			(1,872,544)
Shares acquired and retired		(213)		(34)	(179)
Shares exchanged — benefit plans, shares			(64,060)
Shares exchanged — benefit plans		(8)		(1)	(7)
Forfeitures of restricted stock, shares			(18,882)
Ending balance, shares at Dec. 31, 2023	83,635,807		83,635,807
Ending balance at Dec. 31, 2023	$ 4,258	$ 4,258		$ 1,456	$ 3,121	$ (319)