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, 2020		$ 33,559	$ 135	$ 2,410	$ 37,984	$ 8,934	$ (15,904)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,293	0	0	1,293	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(565)	0	0	0	(565)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(1,567)	0	0	0	(1,567)	0
Unrealized gains (losses) on derivatives during period, net of income taxes		1	0	0	0	1	0
Pension liability adjustment during period, net of income taxes		4	0	0	0	4	0
Dividends to shareholders	[1]	0	0	0	0	0	0
Exercise of stock options		9	0	9	0	0	0
Share-based compensation		9	0	9	0	0	0
Purchases of treasury stock		(668)	0	0	0	0	(668)
Treasury stock reissued		28	0	10	0	0	18
Balance, end of period at Mar. 31, 2021		32,103	135	2,438	39,277	6,807	(16,554)
Balance, beginning of period at Dec. 31, 2020		33,559	135	2,410	37,984	8,934	(15,904)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		3,286
Balance, end of period at Sep. 30, 2021		33,552	135	2,491	40,830	7,662	(17,566)
Balance, beginning of period at Dec. 31, 2020		33,559	135	2,410	37,984	8,934	(15,904)
Balance, end of period at Dec. 31, 2021		33,253	135	2,529	41,381	7,393	(18,185)
Balance, beginning of period at Mar. 31, 2021		32,103	135	2,438	39,277	6,807	(16,554)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,105	0	0	1,105	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		13	0	0	0	13	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		1,198	0	0	0	1,198	0
Unrealized gains (losses) on derivatives during period, net of income taxes		0	0	0	0	0	0
Pension liability adjustment during period, net of income taxes		1	0	0	0	1	0
Dividends to shareholders	[1]	(220)	0	0	(220)	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		(500)	0	0	0	0	(500)
Treasury stock reissued		13	0	5	0	0	8
Balance, end of period at Jun. 30, 2021		33,735	135	2,465	40,162	8,019	(17,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		888	0	0	888	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(99)	0	0	0	(99)	0
Unrealized gains (losses) on fixed maturity securities during period, net of income taxes and reclassification adjustments		(261)	0	0	0	(261)	0
Unrealized gains (losses) on derivatives during period, net of income taxes		2	0	0	0	2	0
Pension liability adjustment during period, net of income taxes		1	0	0	0	1	0
Dividends to shareholders	[1]	(220)	0	0	(220)	0	0
Exercise of stock options		2	0	2	0	0	0
Share-based compensation		16	0	16	0	0	0
Purchases of treasury stock		(527)	0	0	0	0	(527)
Treasury stock reissued		15	0	8	0	0	7
Balance, end of period at Sep. 30, 2021		33,552	135	2,491	40,830	7,662	(17,566)
Balance, beginning of period at Dec. 31, 2021		33,253	135	2,529	41,381	7,393	(18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,032	0	0	1,032	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(469)	0	0	0	(469)	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
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		29,527	135	2,560	42,413	3,113	(18,694)
Balance, beginning of period at Dec. 31, 2021		33,253	135	2,529	41,381	7,393	(18,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		4,016
Balance, end of period at Sep. 30, 2022		24,152	135	2,615	44,892	(3,511)	(19,979)
Balance, beginning of period at Mar. 31, 2022		29,527	135	2,560	42,413	3,113	(18,694)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,388	0	0	1,388	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(807)	0	0	0	(807)	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
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		26,387	135	2,589	43,547	(548)	(19,336)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		1,596	0	0	1,596	0	0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(1,166)	0	0	0	(1,166)	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
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		$ 24,152	$ 135	$ 2,615	$ 44,892	$ (3,511)	$ (19,979)

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