INVESTMENTS - Investments in Variable Interest Entities Not Consolidated (Details) - USD ($) $ in Millions	Dec. 31, 2016		Dec. 31, 2015
Variable Interest Entity [Line Items]
Securities held to maturity, fixed maturities, amortized cost	$ 33,350		$ 33,459
Securities held to maturity, fixed maturities, fair value	40,021		37,520
Other investments, amortized cost	1,450	[1]	294
Assets, fair value	83,044		72,996
Variable Interest Entity, Not Consolidated
Variable Interest Entity [Line Items]
Securities available for sale, fixed maturities, amortized cost	4,729		4,731
Securities available for sale, fixed maturities, fair value	5,261		5,093
Securities available for sale, perpetual securities, amortized cost	172		249
Securities available for sale, perpetual securities, fair value	200		253
Securities held to maturity, fixed maturities, amortized cost	2,563		2,477
Securities held to maturity, fixed maturities, fair value	2,948		2,636
Other investments, amortized cost	1		0
Other investments, fair value disclosure	1		0
Assets, amortized cost	7,465		7,457
Assets, fair value	$ 8,410		$ 7,982

[1] Includes $819 in 2016 of loan receivables from consolidated variable interest entities