INVESTMENTS - Contractual and Economic Maturities of Investments in Fixed Maturities (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Available for sale:
Due in one year or less	$ 883
Due after one year through five years	8,415
Due after five years through 10 years	10,744
Due after 10 years	61,058
Mortgage- and asset-backed securities	374
Total fixed maturity securities, available for sale, amortized cost	81,474	$ 76,856
Held to maturity:
Due in one year or less	194
Due after one year through five years	1,366
Due after five years through 10 years	540
Due after 10 years	28,615
Mortgage- and asset-backed securities	18
Total fixed maturity securities, held to maturity, amortized cost	30,733	30,318
Available for sale:
Due in one year or less	909
Due after one year through five years	8,525
Due after five years through 10 years	12,043
Due after 10 years	72,054
Mortgage- and asset-backed securities	409
Total fixed maturity securities, available for sale, fair value	93,940	82,895
Held to maturity:
Due in one year or less	198
Due after one year through five years	1,471
Due after five years through 10 years	610
Due after 10 years	36,524
Mortgage- and asset-backed securities	19
Total fixed maturity securities, held to maturity, fair value	$ 38,822	$ 36,722