UNAUDITED CONSOLIDATED QUARTERLY FINANCIAL DATA - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Net premium income	$ 3,385	$ 3,476	$ 3,573	$ 3,688	$ 3,523	$ 3,535	$ 3,764	$ 4,079	$ 14,123	[1]	$ 14,901	[1]	$ 17,095	[1]
Net investment income	865	1,004	999	943	896	920	937	903	3,811		3,656		3,818
Net investment gains (losses)	(511)	423	555	123	(521)	199	564	122	590		363		468
Other income (loss)	38	47	45	46	50	50	50	69	177		220		173
Total revenues	3,777	4,950	5,172	4,800	3,948	4,704	5,315	5,173	18,701		19,140		21,554
Total benefits and expenses	3,488	3,145	3,347	3,458	3,410	3,375	3,607	3,879	13,439		14,271		16,346
Earnings before income taxes	289	1,805	1,825	1,342	538	1,329	1,708	1,294	5,262		4,869		5,208
Income tax expense (benefit)	21	236	191	154	342	(452)	314	247	$ 603		$ 451		$ 977
Net earnings	$ 268	$ 1,569	$ 1,634	$ 1,188	$ 196	$ 1,781	$ 1,394	$ 1,047
Basic (in dollars per share)	$ 0.46	$ 2.65	$ 2.72	$ 1.94	$ 0.32	$ 2.83	$ 2.18	$ 1.61	$ 7.81		$ 6.96		$ 6.28
Diluted (in dollars per share)	$ 0.46	$ 2.64	$ 2.71	$ 1.94	$ 0.31	$ 2.82	$ 2.17	$ 1.60	$ 7.78		$ 6.93		$ 6.25

[1] Includes a gain (loss) of $20, $(42) and $(11) in 2023, 2022 and 2021, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.