INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Available for sale:
Due in one year or less	[1]	$ 957
Due after one year through five years	[1]	8,899
Due after five years through 10 years	[1]	12,751
Due after 10 years	[1]	65,023
Mortgage- and asset-backed securities	[1]	509
Total fixed maturity securities, available for sale, amortized cost	[1]	88,139
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]	107
Due after 10 years	[1]	23,402
Mortgage- and asset-backed securities	[1]	0
Total fixed maturity securities, held to maturity, amortized cost	[1]	23,509
Available for sale:
Due in one year or less		994
Due after one year through five years		9,108
Due after five years through 10 years		14,450
Due after 10 years		74,861
Mortgage- and asset-backed securities		546
Total fixed maturity securities, available for sale, fair value		99,959	$ 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		123
Due after 10 years		29,170
Mortgage- and asset-backed securities		0
Total fixed maturity securities, held to maturity, fair value		$ 29,293	$ 37,594

[1] Net of allowance for credit losses