INSURANCE LIABILITIES - GMDB and GMIB Liabilities and Other Policyholder's Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
GMDB Direct [Member]
Direct Liability
Balance, beginning of period	$ 4,654	$ 4,054
Paid guarantee benefits	(118)	(101)
Other changes in reserves	129	96
Balance, end of period	4,665	4,049
GMDB
Direct Liability
Balance, beginning of period	(107)	(2,030)
Paid guarantee benefits	4	(54)
Other changes in reserves	0	62
Balance, end of period	(103)	(2,022)
GMIB Direct [Member]
Direct Liability
Balance, beginning of period	3,741	4,754
Paid guarantee benefits	(56)	(32)
Other changes in reserves	55	(139)
Balance, end of period	3,740	4,583
GMIB Ceded [Member]
Direct Liability
Balance, beginning of period	(1,991)	(10,488)
Paid guarantee benefits	21	27
Other changes in reserves	(39)	788
Balance, end of period	$ (2,009)	$ (9,673)