BENEFITS Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 8
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure
Company Contributions Vested	100.00%
Company Contributions Years	five
Defined Contribution Plan, Cost Recognized	$ 1	$ 2	$ 3
Defined Contribution Plan, Employer Matching Contribution, Percent	3.00%
Savings Plan [Member]
Defined Benefit Plan Disclosure
Defined Contribution Plan, Cost Recognized	$ 2	$ 3	$ 6
Defined Contribution Plan Employers Matching Contribution Percentage to Participants Percentage Conribution	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	5.00%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure
Large Cap US Equitiies	36.00%	38.00%
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Arising During Period, before Tax	$ 1
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.84%	3.68%
Fixed Income Securities	54.00%	52.00%
Cash Fund Investments	10.00%	10.00%
Other Postretirement Benefit Plan [Member] | Equity Securities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	25.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	35.00%
Other Postretirement Benefit Plan [Member] | Fixed Income Securities
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	65.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	75.00%
Other Postretirement Benefit Plan [Member] | Cash and Cash Equivalents
Defined Benefit Plan Disclosure
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	10.00%