INVESTMENTS - Investments in Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions		Dec. 31, 2020		Dec. 31, 2019
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		$ 91,630		$ 79,371
Available for sale, fixed maturity securities		105,882		91,262
Equity securities		1,283		802
Commercial mortgage and other loans		10,554		9,569
Commercial mortgage and other loans, fair value		10,655		9,648
Other investments		2,429		1,477
Asset derivatives		583		482
Assets, fair value		114,028		98,070
Liability derivatives		697		586
Liabilities		131,527		123,809
Liabilities, fair value		697		586
Variable Interest Entity, Consolidated
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		3,487	[1]	3,308
Available for sale, fixed maturity securities		4,596		4,312
Commercial mortgage and other loans		8,964	[1]	7,956
Commercial mortgage and other loans, fair value		9,040		8,015
Other investments	[2]	826	[1]	494
Other investments, fair value	[2]	826		494
Asset derivatives, amortized cost	[3]	133	[1]	169
Asset derivatives	[3]	133		169
Assets, amortized cost		13,410	[1]	11,927
Assets, fair value		14,595		12,990
Liability derivatives, amortized cost	[3]	231	[1]	126
Liability derivatives	[3]	231		126
Liabilities		231	[1]	126
Liabilities, fair value		$ 231		$ 126

[1] Net of allowance for credit losses

[2] Consists entirely of alternative investments in limited partnerships

[3] Consists entirely of derivatives