INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Available for sale:
Due in one year or less	$ 583
Due after one year through five years	7,933
Due after five years through 10 years	11,347
Due after 10 years	59,130
Mortgage- and asset-backed securities	378
Total fixed maturity securities, available for sale, amortized cost	79,371	$ 76,856
Held to maturity:
Due in one year or less	265
Due after one year through five years	1,227
Due after five years through 10 years	532
Due after 10 years	28,045
Mortgage- and asset-backed securities	16
Total fixed maturity securities, held to maturity, amortized cost	30,085	30,318
Available for sale:
Due in one year or less	612
Due after one year through five years	8,122
Due after five years through 10 years	12,819
Due after 10 years	69,299
Mortgage- and asset-backed securities	410
Total fixed maturity securities, available for sale, fair value	91,262	82,895
Held to maturity:
Due in one year or less	270
Due after one year through five years	1,330
Due after five years through 10 years	599
Due after 10 years	35,378
Mortgage- and asset-backed securities	17
Total fixed maturity securities, held to maturity, fair value	$ 37,594	$ 36,722