Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions		Total	Cumulative effect, period of adoption, adjustment	Cumulative effect, period of adoption, adjusted balance	Common stock	Common stock Cumulative effect, period of adoption, adjustment	Common stock Cumulative effect, period of adoption, adjusted balance	Additional paid-in capital	Additional paid-in capital Cumulative effect, period of adoption, adjustment	Additional paid-in capital Cumulative effect, period of adoption, adjusted balance	Retained earnings	Retained earnings Cumulative effect, period of adoption, adjustment	Retained earnings Cumulative effect, period of adoption, adjusted balance	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Cumulative effect, period of adoption, adjustment	Accumulated other comprehensive income (loss) Cumulative effect, period of adoption, adjusted balance	Treasury Stock, Common	Treasury Stock, Common Cumulative effect, period of adoption, adjustment	Treasury Stock, Common Cumulative effect, period of adoption, adjusted balance
Balance, beginning of period at Dec. 31, 2020		$ 33,559			$ 135			$ 2,410			$ 37,984			$ 8,934			$ (15,904)
Balance, beginning of period (Accounting Standards Update 2018-12) at Dec. 31, 2020			$ (18,894)	$ 14,665		$ 0	$ 135		$ 0	$ 2,410		$ (324)	$ 37,660		$ (18,570)	$ (9,636)		$ 0	$ (15,904)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		4,231			0			0			4,231			0			0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(876)			0			0			0			(876)			0
Unrealized gains (losses) on fixed maturity securities during the period, net of income taxes and reclassification adjustments		(759)			0			0			0			(759)			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		2,738			0			0			0			2,738			0
Pension liability adjustment during period, net of income taxes		118			0			0			0			118			0
Dividends to shareholders	[1]	(928)			0			0			(928)			0			0
Exercise of stock options		18			0			18			0			0			0
Share-based compensation		61			0			61			0			0			0
Purchases of treasury stock		(2,322)			0			0			0			0			(2,322)
Treasury stock reissued		81			0			40			0			0			41
Balance, end 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		4,418			0			0			4,418			0			0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(1,579)			0			0			0			(1,579)			0
Unrealized gains (losses) on fixed maturity securities during the period, net of income taxes and reclassification adjustments		(10,304)			0			0			0			(10,304)			0
Unrealized gains (losses) on derivatives during period, net of income taxes		3			0			0			0			3			0
Effect of changes in discount rate assumptions during period, net of income taxes		13,732			0			0			0			13,732			0
Pension liability adjustment during period, net of income taxes		130			0			0			0			130			0
Dividends to shareholders	[1]	(1,014)			0			0			(1,014)			0			0
Exercise of stock options		12			0			12			0			0			0
Share-based compensation		62			0			62			0			0			0
Purchases of treasury stock		(2,425)			0			0			0			0			(2,425)
Treasury stock reissued		74			0			38			0			0			36
Balance, end 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		4,659			0			0			4,659			0			0
Unrealized foreign currency translation gains (losses) during period, net of income taxes		(505)			0			0			0			(505)			0
Unrealized gains (losses) on fixed maturity securities during the period, net of income taxes and reclassification adjustments		1,841			0			0			0			1,841			0
Unrealized gains (losses) on derivatives during period, net of income taxes		5			0			0			0			5			0
Effect of changes in discount rate assumptions during period, net of income taxes		(460)			0			0			0			(460)			0
Pension liability adjustment during period, net of income taxes		28			0			0			0			28			0
Dividends to shareholders	[1]	(1,033)			0			0			(1,033)			0			0
Exercise of stock options		13			0			13			0			0			0
Share-based compensation		75			1			74			0			0			0
Purchases of treasury stock		(2,854)			0			0			0			0			(2,854)
Treasury stock reissued		76			0			43			0			0			33
Balance, end of period at Dec. 31, 2023		$ 21,985			$ 136			$ 2,771			$ 47,993			$ (5,520)			$ (23,395)

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