INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Available for sale:
Due in one year or less	[1]	$ 1,031
Due after one year through five years	[1]	8,938
Due after five years through 10 years	[1]	13,159
Due after 10 years	[1]	66,091
Mortgage- and asset-backed securities	[1]	681
Total fixed maturity securities, available for sale, amortized cost	[1]	89,900
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]	251
Due after 10 years	[1]	23,686
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities, held to maturity, amortized cost	[1]	23,937
Available for sale:
Due in one year or less		1,053
Due after one year through five years		9,175
Due after five years through 10 years		15,092
Due after 10 years		77,091
Mortgage- and asset-backed securities		717
Total fixed maturity securities, available for sale, fair value		103,128	$ 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		292
Due after 10 years		29,515
Mortgage- and asset-backed securities		0
Total fixed maturity securities, held to maturity, fair value		$ 29,807	$ 37,594

[1] Net of allowance for credit losses