PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment - PPE Type (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 3,338	$ 3,395
Accumulated depreciation	(286)	(269)
Net property, plant and equipment	3,052	3,126
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	8	8
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	340	340
Pipelines [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	2,387	2,353
Natural Gas Storage [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	329	323
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	24	23
Right Of Way [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	23	23
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	34	33
Linepack [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	57	57
Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	99	192
Construction work in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 37	$ 43