PLANT, PROPERTY AND EQUIPMENT (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
PLANT, PROPERTY AND EQUIPMENT
Cost	$ 2,705	$ 2,716
Accumulated Depreciation	(737)	(674)
Net Book Value	1,968	2,042
Pipeline
PLANT, PROPERTY AND EQUIPMENT
Cost	2,038	2,045
Accumulated Depreciation	(574)	(522)
Net Book Value	1,464	1,523
Compression
PLANT, PROPERTY AND EQUIPMENT
Cost	514	520
Accumulated Depreciation	(126)	(120)
Net Book Value	388	400
Metering and other
PLANT, PROPERTY AND EQUIPMENT
Cost	145	146
Accumulated Depreciation	(37)	(32)
Net Book Value	108	114
Construction in progress
PLANT, PROPERTY AND EQUIPMENT
Cost	8	5
Net Book Value	$ 8	$ 5