INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Mar. 31, 2021		Dec. 31, 2020
Available for sale:
Due in one year or less	[1]	$ 907
Due after one year through five years	[1]	8,487
Due after five years through 10 years	[1]	13,637
Due after 10 years	[1]	64,274
Mortgage- and asset-backed securities	[1]	1,134
Total fixed maturity securities, available for sale, amortized cost	[1]	88,439
Held to maturity:
Due in one year or less	[1]	0
Due after one year through five years	[1]	45
Due after five years through 10 years	[1]	4,103
Due after 10 years	[1]	18,720
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities, held to maturity, amortized cost		22,868	[1]	$ 24,464
Available for sale:
Due in one year or less		922
Due after one year through five years		9,005
Due after five years through 10 years		15,827
Due after 10 years		73,806
Mortgage- and asset-backed securities		1,184
Total fixed maturity securities, available for sale, fair value		100,744		105,882
Held to maturity:
Due in one year or less		0
Due after one year through five years		50
Due after five years through 10 years		4,788
Due after 10 years		23,218
Mortgage- and asset-backed securities		0
Total fixed maturity securities, held to maturity, fair value		$ 28,056		$ 30,399

[1] Net of allowance for credit losses