INSURANCE LIABILITIES - GMDB and GMIB Liabilities and Other Policyholder's Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Direct Liability
Balance, beginning of period	$ 8,882	$ 7,035
Paid guarantee benefits	(133)	(123)
Other changes in reserve	(43)	2,104
Balance, end of period	8,706	9,016
GMDB
Direct Liability
Balance, beginning of period	4,080	3,165
Paid guarantee benefits	(101)	(89)
Other changes in reserve	96	187
Balance, end of period	4,075	3,263
GMIB
Direct Liability
Balance, beginning of period	4,802	3,870
Paid guarantee benefits	(32)	(34)
Other changes in reserve	(139)	1,917
Balance, end of period	$ 4,631	$ 5,753