EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 9	$ 10	$ 18	$ 20
Interest cost	19	21	37	42
Expected return on assets	(27)	(30)	(54)	(61)
Recognized actuarial loss (gain)	6	6	12	13
Net pension expense	$ 7	$ 7	$ 13	$ 14