INVESTMENTS - Investments in Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		$ 79,371	$ 76,856
Available for sale, fixed maturity securities		91,262	82,895
Equity securities		802	987
Commercial mortgage and other loans		9,569	6,919
Commercial mortgage and other loans, fair value		9,648	6,893
Other investments		1,477	787
Asset derivatives		482	417
Assets, fair value		98,070	88,788
Liability derivatives		586	387
Liabilities		123,809	116,944
Liabilities, fair value		586	387
Variable Interest Entity, Consolidated
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		3,308	3,849
Available for sale, fixed maturity securities		4,312	4,466
Equity securities, FV-NI, cost		0	160
Equity securities		0	160
Commercial mortgage and other loans		7,956	5,528
Commercial mortgage and other loans, fair value		8,015	5,506
Other investments	[1]	494	328
Other investments, fair value	[1]	494	328
Asset derivatives, amortized cost	[2]	169	182
Asset derivatives	[2]	169	182
Assets, amortized cost		11,927	10,047
Assets, fair value		12,990	10,642
Liability derivatives, amortized cost	[2]	126	102
Liability derivatives	[2]	126	102
Liabilities		126	102
Liabilities, fair value		$ 126	$ 102

[1] Consists entirely of alternative investments in limited partnerships

[2] Consists entirely of derivatives