INVESTMENTS - Components of Net Investment Income (Detail) - USD ($) $ 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
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income										$ 4,046	$ 3,882	$ 4,036
Less investment expenses										235	226	218
Net investment income		$ 865	$ 1,004	$ 999	$ 943	$ 896	$ 920	$ 937	$ 903	3,811	3,656	3,818
Corporate and other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income										(77)	30	(73)
Change in value of federal historic rehabilitation and solar tax credit investments										(343)	(91)	(138)
Federal historic rehabilitation and solar tax credits, amount										334	83	115
Fixed maturity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income										2,873	2,926	3,068
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income										28	31	35
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income										1,002	716	570
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	[1]										131	356
Gross investment loss	[1]									(70)
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income										$ 213	$ 78	$ 7

[1] The change in value of federal historic rehabilitation and solar investments in partnerships of $343, $91, and $138 in 2023, 2022, and 2021, respectively, is included as a reduction to net investment income. Tax credits on these investments of $334, $83, and $115 in 2023, 2022, and 2021, respectively, have been recorded as an income tax benefit in the consolidated statement of earnings.