INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Jun. 30, 2021		Dec. 31, 2020
Available for sale:
Due in one year or less	[1]	$ 928
Due after one year through five years	[1]	8,392
Due after five years through 10 years	[1]	13,795
Due after 10 years	[1]	64,111
Mortgage- and asset-backed securities	[1]	1,236
Total fixed maturity securities, available for sale, amortized cost	[1]	88,462
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]	6,635
Due after 10 years	[1]	16,211
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities, held to maturity, amortized cost		22,891	[1]	$ 24,464
Available for sale:
Due in one year or less		936
Due after one year through five years		8,943
Due after five years through 10 years		16,220
Due after 10 years		74,902
Mortgage- and asset-backed securities		1,283
Total fixed maturity securities, available for sale, fair value		102,284		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		7,766
Due after 10 years		20,338
Mortgage- and asset-backed securities		0
Total fixed maturity securities, held to maturity, fair value		$ 28,154		$ 30,399

[1] Net of allowance for credit losses