CONSOLIDATED DEBT Equipment Financing Capital Lease (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Capital Leased Assets [Line Items]
Proceeds from Long-term Capital Lease Obligations	$ 15	$ 63	$ 0
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	3.48%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	4.52%
Capital Lease Obligations	$ 73	$ 62
Capital Leases, Future Minimum Payments Due	4
Capital Leases, Future Minimum Payments Due in Two Years	4
Capital Leases, Future Minimum Payments Due in Three Years	5
Capital Leases, Future Minimum Payments Due in Four Years	5
Capital Leases, Future Minimum Payments Due in Five Years	5
Capital Leases, Future Minimum Payments Due Thereafter	$ 50
Maximum [Member]
Capital Leased Assets [Line Items]
Debt Instrument, Term	12 years
Minimum [Member]
Capital Leased Assets [Line Items]
Debt Instrument, Term	10 years