Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance, beginning of period at Dec. 31, 2022		$ 20,140	$ 135	$ 2,641	$ 44,367	$ (6,429)	$ (20,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,188	0	0	1,188	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(54)	0	0	0	(54)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		1,991	0	0	0	1,991	0
Unrealized gains (losses) on derivatives during period, net of income taxes		1	0	0	0	1	0
Effect of changes in discount rate assumptions during period, net of income taxes		(2,794)	0	0	0	(2,794)	0
Pension liability adjustment during period, net of income taxes		7	0	0	0	7	0
Dividends to shareholders	[1]	0	0	0	0	0	0
Exercise of stock options		3	0	3	0	0	0
Share-based compensation		14	0	14	0	0	0
Purchases of treasury stock		(732)	0	0	0	0	(732)
Treasury stock reissued		20	0	7	0	0	13
Balance, end of period at Mar. 31, 2023		19,784	135	2,665	45,555	(7,278)	(21,293)
Balance, beginning of period at Dec. 31, 2022		20,140	135	2,641	44,367	(6,429)	(20,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of changes in discount rate assumptions during period, net of income taxes						(460)
Balance, end of period at Dec. 31, 2023		21,985	136	2,771	47,993	(5,520)	(23,395)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,879	0	0	1,879	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(597)	0	0	0	(597)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(47)	0	0	0	(47)	0
Unrealized gains (losses) on derivatives during period, net of income taxes		(4)	0	0	0	(4)	0
Effect of changes in discount rate assumptions during period, net of income taxes		1,065	0	0	0	1,065	0
Pension liability adjustment during period, net of income taxes		1	0	0	0	1	0
Dividends to shareholders	[1]	0	0	0	0	0	0
Exercise of stock options		4	0	4	0	0	0
Share-based compensation		18	0	18	0	0	0
Purchases of treasury stock		(793)	0	0	0	0	(793)
Treasury stock reissued		26	0	13	0	0	13
Balance, end of period at Mar. 31, 2024		$ 23,537	$ 136	$ 2,806	$ 49,872	$ (5,102)	$ (24,175)

[1] Dividends to shareholders are recorded in the period in which they are declared.