INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Available for sale:
Due in one year or less	[1]	$ 1,078
Due after one year through five years	[1]	8,992
Due after five years through 10 years	[1]	12,399
Due after 10 years	[1]	64,891
Mortgage- and asset-backed securities	[1]	458
Total fixed maturity securities, available for sale, amortized cost	[1]	87,818
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]	49
Due after 10 years	[1]	23,229
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities, held to maturity, amortized cost	[1]	23,278
Available for sale:
Due in one year or less		1,105
Due after one year through five years		8,806
Due after five years through 10 years		13,221
Due after 10 years		72,659
Mortgage- and asset-backed securities		497
Total fixed maturity securities, available for sale, fair value		96,288	$ 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		55
Due after 10 years		29,292
Mortgage- and asset-backed securities		0
Total fixed maturity securities, held to maturity, fair value		$ 29,347	$ 37,594

[1] Net of allowance for credit losses