INVESTMENTS - Investments in Variable Interest Entities Not Consolidated (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		$ 88,465	$ 91,630
Available for sale, fixed maturity securities		100,744	105,882
Securities held to maturity, fixed maturities, amortized cost		22,876	24,474
Held to maturity, fixed maturity securities, fair value		28,056	30,399
Other investments		2,666	2,429
Assets, fair value		109,044	114,028
Variable Interest Entity, Not Consolidated
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		5,142	5,477
Available for sale, fixed maturity securities		6,269	6,767
Other investments	[1]	202	178
Other investments, fair value	[1]	202	178
Assets, amortized cost		5,344	5,655
Assets, fair value		$ 6,471	$ 6,945

[1] Consists entirely of alternative investments in limited partnerships