INVESTMENTS - Investments in Variable Interest Entities Not Consolidated (Details) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		$ 87,228	$ 91,630
Available for sale, fixed maturity securities		100,722	105,882
Securities held to maturity, fixed maturities, amortized cost		22,622	24,474
Held to maturity, fixed maturity securities, fair value		27,748	30,399
Other investments		3,612	2,429
Assets, fair value		110,969	114,028
Variable Interest Entity, Not Consolidated
Variable Interest Entity [Line Items]
Available for sale, fixed maturity securities, amortized cost		4,990	5,477
Available for sale, fixed maturity securities		6,119	6,767
Other investments	[1]	247	178
Other investments, fair value	[1]	247	178
Assets, amortized cost		5,237	5,655
Assets, fair value		$ 6,366	$ 6,945

[1] Consists entirely of alternative investments in limited partnerships