BENEFITS Benefits - Estimate of Expected Benefit Payments (Details) - Other Postretirement Benefit Plan [Member] $ in Millions	Dec. 31, 2016 USD ($)
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 2
Defined Benefit Plan, Expected Future Benefit Payments in Year One, net	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Two, net	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Three, net	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Four, net	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	1
Defined Benefit Plan, Expected Future Benefit Payments in Year Five, net	1
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	6
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter, net	$ 6