EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 9	$ 11	$ 27	$ 31
Interest cost	18	21	55	63
Expected return on assets	(27)	(31)	(81)	(92)
Amortization of prior service costs	(1)	(1)	(1)	(1)
Recognized actuarial loss (gain)	7	7	19	20
Net pension expense	$ 6	$ 7	$ 19	$ 21