INVESTMENTS - Investments in Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		$ 81,195	$ 76,856
Available for sale, fixed maturity securities		92,435	82,895
Equity securities		1,087	987
Commercial mortgage and other loans		7,622	6,919
Commercial mortgage and other loans, fair value		7,663	6,893
Other investments		1,427	787
Asset derivatives		526	417
Assets, fair value		97,744	88,788
Liability derivatives		347	387
Liabilities		123,159	116,944
Liabilities, fair value		347	387
Variable Interest Entity, Consolidated
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		3,729	3,849
Available for sale, fixed maturity securities		4,599	4,466
Equity securities, FV-NI, cost		187	160
Equity securities		187	160
Commercial mortgage and other loans		6,233	5,528
Commercial mortgage and other loans, fair value		6,259	5,506
Other investments	[1]	410	328
Other investments, fair value	[1]	410	328
Asset derivatives, amortized cost	[2]	201	182
Asset derivatives	[2]	201	182
Assets, amortized cost		10,760	10,047
Assets, fair value		11,656	10,642
Liability derivatives, amortized cost	[2]	107	102
Liability derivatives	[2]	107	102
Liabilities		107	102
Liabilities, fair value		$ 107	$ 102

[1] Consists entirely of alternative investments in limited partnerships

[2] Consists entirely of derivatives