INVESTMENTS (TRADING SECURITIES) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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	$ 51	$ 64
Net investment gains (losses) recognized on securities sold during the period	2	(6)
Unrealized and realized gains (losses) on trading securities arising during the period	53	58
Interest and dividend income from trading securities	40	19
Net investment income (loss) from trading securities	$ 93	$ 77