INVESTMENTS - Investments in Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions		Mar. 31, 2020		Dec. 31, 2019
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		$ 87,881		$ 79,371
Available for sale, fixed maturity securities		96,288		91,262
Equity securities		660		802
Commercial mortgage and other loans		10,750		9,569
Commercial mortgage and other loans, fair value		10,390		9,648
Other investments		1,843		1,477
Asset derivatives		472		482
Assets, fair value		102,460		98,070
Liability derivatives		723		586
Liabilities		125,214		123,809
Liabilities, fair value		723		586
Variable Interest Entity, Consolidated
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		3,208	[1]	3,308
Available for sale, fixed maturity securities		3,786		4,312
Commercial mortgage and other loans		9,051		7,956
Commercial mortgage and other loans, fair value		8,737		8,015
Other investments	[2]	550		494
Other investments, fair value	[2]	550		494
Asset derivatives, amortized cost	[3]	89	[1]	169
Asset derivatives	[3]	89		169
Assets, amortized cost		12,898	[1]	11,927
Assets, fair value		13,162		12,990
Liability derivatives, amortized cost	[3]	235	[1]	126
Liability derivatives	[3]	235		126
Liabilities		235	[1]	126
Liabilities, fair value		$ 235		$ 126

[1] Net of allowance for credit losses

[2] Consists entirely of alternative investments in limited partnerships

[3] Consists entirely of derivatives