INVESTMENTS (TRADING SECURITIES) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Realized and Unrealized Gain (Loss) on Trading Securities [Abstract]
Net investment gains (losses) recognized during the period on securities held at the end of the period	$ 57	$ 55	$ 108	$ 119
Net investment gains (losses) recognized on securities sold during the period	23	(4)	25	(10)
Unrealized and realized gains (losses) on trading securities arising during the period	80	51	133	109
Interest and dividend income from trading securities	49	29	89	48
Net investment income (loss) from trading securities	$ 129	$ 80	$ 222	$ 157