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, 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)
Balance, beginning of period at Dec. 31, 2024		26,098	136	2,894	52,277	(2,978)	(26,231)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		29	0	0	29	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		449	0	0	0	449	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(1,257)	0	0	0	(1,257)	0
Unrealized gains (losses) on derivatives during period, net of income taxes		2	0	0	0	2	0
Effect of changes in discount rate assumptions during period, net of income taxes		1,893	0	0	0	1,893	0
Pension liability adjustment during period, net of income taxes		32	0	0	0	32	0
Dividends to shareholders	[1]	2	0	0	2	0	0
Exercise of stock options		4	0	4	0	0	0
Share-based compensation		8	0	8	0	0	0
Purchases of treasury stock		(949)	0	0	0	0	(949)
Treasury stock reissued		27	0	13	0	0	14
Balance, end of period at Mar. 31, 2025		$ 26,338	$ 136	$ 2,919	$ 52,308	$ (1,859)	$ (27,166)

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