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, 2021		$ 17,031	$ 135	$ 2,529	$ 40,963	$ (8,411)	$ (18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,047	0	0	1,047	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(453)	0	0	0	(453)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(3,815)	0	0	0	(3,815)	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		4,224	0	0	0	4,224	0
Pension liability adjustment during period, net of income taxes		3	0	0	0	3	0
Dividends to shareholders	[1]	0	0	0	0	0	0
Exercise of stock options		6	0	6	0	0	0
Share-based compensation		13	0	13	0	0	0
Purchases of treasury stock		(523)	0	0	0	0	(523)
Treasury stock reissued		26	0	12	0	0	14
Balance, end of period at Mar. 31, 2022		17,560	135	2,560	42,010	(8,451)	(18,694)
Balance, beginning of period at Dec. 31, 2021		17,031	135	2,529	40,963	(8,411)	(18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		4,222
Effect of changes in discount rate assumptions during period, net of income taxes		11,800
Balance, end of period at Sep. 30, 2022		19,946	135	2,615	44,680	(7,505)	(19,979)
Balance, beginning of period at Dec. 31, 2021		17,031	135	2,529	40,963	(8,411)	(18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of changes in discount rate assumptions during period, net of income taxes		13,700
Balance, end of period at Dec. 31, 2022		20,140	135	2,641	44,367	(6,429)	(20,574)
Balance, beginning of period at Mar. 31, 2022		17,560	135	2,560	42,010	(8,451)	(18,694)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,394	0	0	1,394	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(780)	0	0	0	(780)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(2,857)	0	0	0	(2,857)	0
Unrealized gains (losses) on derivatives during period, net of income taxes		0	0	0	0	0	0
Effect of changes in discount rate assumptions during period, net of income taxes		5,105	0	0	0	5,105	0
Pension liability adjustment during period, net of income taxes		3	0	0	0	3	0
Dividends to shareholders	[1]	(254)	0	0	(254)	0	0
Exercise of stock options		1	0	1	0	0	0
Share-based compensation		19	0	19	0	0	0
Purchases of treasury stock		(650)	0	0	0	0	(650)
Treasury stock reissued		17	0	9	0	0	8
Balance, end of period at Jun. 30, 2022		19,558	135	2,589	43,150	(6,980)	(19,336)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,781	0	0	1,781	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(1,156)	0	0	0	(1,156)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(1,799)	0	0	0	(1,799)	0
Unrealized gains (losses) on derivatives during period, net of income taxes		0	0	0	0	0	0
Effect of changes in discount rate assumptions during period, net of income taxes		2,428	0	0	0	2,428	0
Pension liability adjustment during period, net of income taxes		2	0	0	0	2	0
Dividends to shareholders	[1]	(251)	0	0	(251)	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		(651)	0	0	0	0	(651)
Treasury stock reissued		17	0	9	0	0	8
Balance, end of period at Sep. 30, 2022		19,946	135	2,615	44,680	(7,505)	(19,979)
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]
Net earnings		4,391
Effect of changes in discount rate assumptions during period, net of income taxes		1,200
Balance, end of period at Sep. 30, 2023		22,669	136	2,729	48,257	(5,760)	(22,693)
Balance, beginning of period at Mar. 31, 2023		19,784	135	2,665	45,555	(7,278)	(21,293)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,634	0	0	1,634	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(631)	0	0	0	(631)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		689	0	0	0	689	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		(165)	0	0	0	(165)	0
Pension liability adjustment during period, net of income taxes		46	0	0	0	46	0
Dividends to shareholders	[1]	(252)	0	0	(252)	0	0
Exercise of stock options		5	0	5	0	0	0
Share-based compensation		18	1	17	0	0	0
Purchases of treasury stock		(708)	0	0	0	0	(708)
Treasury stock reissued		18	0	10	0	0	8
Balance, end of period at Jun. 30, 2023		20,439	136	2,697	46,937	(7,338)	(21,993)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,569	0	0	1,569	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(235)	0	0	0	(235)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(2,381)	0	0	0	(2,381)	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		4,193	0	0	0	4,193	0
Pension liability adjustment during period, net of income taxes		0	0	0	0	0	0
Dividends to shareholders	[1]	(249)	0	0	(249)	0	0
Exercise of stock options		2	0	2	0	0	0
Share-based compensation		20	0	20	0	0	0
Purchases of treasury stock		(707)	0	0	0	0	(707)
Treasury stock reissued		17	0	10	0	0	7
Balance, end of period at Sep. 30, 2023		$ 22,669	$ 136	$ 2,729	$ 48,257	$ (5,760)	$ (22,693)

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