INVESTMENTS - Investments in Variable Interest Entities Not Consolidated (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Securities held to maturity, fixed maturities, amortized cost		$ 31,998	$ 33,350
Securities held to maturity, fixed maturities, fair value		38,599	40,021
Other Investments	[1]	2,358	1,450
Assets, fair value		88,669	83,044
Variable Interest Entity, Not Consolidated
Variable Interest Entity [Line Items]
Securities available for sale, fixed maturities, amortized cost		4,766	4,729
Securities available for sale, fixed maturities, fair value		5,439	5,261
Securities available for sale, perpetual securities, amortized cost		177	172
Securities available for sale, perpetual securities, fair value		220	200
Securities held to maturity, fixed maturities, amortized cost		2,645	2,563
Securities held to maturity, fixed maturities, fair value		3,047	2,948
Other Investments		50	1
Other investments, fair value		50	1
Assets, amortized cost		7,638	7,465
Assets, fair value		$ 8,756	$ 8,410

[1] Includes $1,500 in 2017 and $819 in 2016 of loan receivables and limited partnerships from consolidated variable interest entities