CLOSED BLOCK - Summarized Financial Information for Closed Block (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Closed Block Liabilities:
Future policy benefits, policyholders’ account balances and other	$ 6,670	$ 6,709
Policyholder dividend obligation	0	0	$ 0	$ 19
Other liabilities	70	47
Total Closed Block liabilities	6,740	6,756
Assets Designated to the Closed Block:
Fixed maturities, available-for-sale, at fair value (amortized cost of $3,606 and $3,680)	3,697	3,672
Fixed maturities, available for sale, amortized cost	3,606	3,680
Mortgage loans on real estate, net of valuation allowance of $0 and $0	1,822	1,824
Mortgage loan valuation allowance	0	0
Policy loans	727	736
Cash and other invested assets	142	76
Other assets	171	179
Total assets designated to the Closed Block	6,559	6,487
Excess of Closed Block liabilities over assets designated to the Closed Block	181	269
Amounts included in accumulated other comprehensive income (loss):
Net unrealized investment gains (losses), net of policyholders’ dividend obligation of $0 and $0	105	8
Maximum future earnings to be recognized from Closed Block assets and liabilities	$ 286	$ 277