INVESTMENTS - Components of Net Investment Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 4,036	$ 3,850	$ 3,755
Less investment expenses	218	212	177
Net investment income	3,818	3,638	3,578
All other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Net investment income	(73)	80	105
Income (Loss) from federal historic rehabilitation and solar tax credit investments	(138)
Federal historic rehabilitation and solar tax credits, amount	115
Fixed maturity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3,068	3,113	3,141
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	35	29	37
Commercial mortgage and other loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	570	545	468
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	356	145	53
Short-term investments and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 7	$ 18	$ 56