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, 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)

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