INSURANCE LIABILITIES - SUMMARY OF NO-LAPSE GUARANTEE LIABILITIES AND OTHER POLICYHOLDER'S LIABILITIES (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Direct Liability
Balance, beginning of period	$ 8,808	$ 6,967
Paid Guaranteed Benefits	(399)	(374)
Balance, end of period	8,123	8,400
Direct Liability
Direct Liability
Balance, beginning of period	692	1,182
Paid Guaranteed Benefits	(13)
Other changes in reserves	76	218
Balance, end of period	755	1,400
Reinsurance Ceded
Direct Liability
Balance, beginning of period	(664)	(606)
Paid Guaranteed Benefits	0
Other changes in reserves	(53)	(68)
Balance, end of period	(717)	(674)
Net
Direct Liability
Balance, beginning of period	28	576
Paid Guaranteed Benefits	(13)
Other changes in reserves	23	150
Balance, end of period	$ 38	$ 726