INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Sep. 30, 2021		Dec. 31, 2020
Available for sale:
Due in one year or less	[1]	$ 914
Due after one year through five years	[1]	8,302
Due after five years through 10 years	[1]	13,291
Due after 10 years	[1]	63,479
Mortgage- and asset-backed securities	[1]	1,242
Total fixed maturity securities, available for sale, amortized cost	[1]	87,228
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]	8,753
Due after 10 years	[1]	13,815
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities, held to maturity, amortized cost		22,613	[1]	$ 24,464
Available for sale:
Due in one year or less		930
Due after one year through five years		8,909
Due after five years through 10 years		15,565
Due after 10 years		74,026
Mortgage- and asset-backed securities		1,292
Total fixed maturity securities, available for sale, fair value		100,722		105,882
Held to maturity:
Due in one year or less		0
Due after one year through five years		49
Due after five years through 10 years		10,207
Due after 10 years		17,492
Mortgage- and asset-backed securities		0
Total fixed maturity securities, held to maturity, fair value		$ 27,748		$ 30,399

[1] Net of allowance for credit losses