INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Available for sale:
Due in one year or less	[1]	$ 1,130
Due after one year through five years	[1]	8,750
Due after five years through 10 years	[1]	13,752
Due after 10 years	[1]	66,951
Mortgage- and asset-backed securities	[1]	1,009
Total fixed maturity securities available for sale	[1]	91,592
Held to maturity:
Due in one year or less	[1]	0
Due after one year through five years	[1]	0
Due after five years through 10 years	[1]	2,212
Due after 10 years	[1]	22,252
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities held to maturity	[1]	24,464
Available for sale:
Due in one year or less		1,125
Due after one year through five years		9,020
Due after five years through 10 years		15,945
Due after 10 years		78,754
Mortgage- and asset-backed securities		1,038
Available for sale, fixed maturity securities		105,882	$ 91,262
Held to maturity:
Due in one year or less		0
Due after one year through five years		0
Due after five years through 10 years		2,594
Due after 10 years		27,805
Mortgage- and asset-backed securities		0
Held to maturity, fixed maturity securities, fair value		$ 30,399	$ 37,594

[1] Net of allowance for credit losses