PLANT, PROPERTY AND EQUIPMENT (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
PLANT, PROPERTY AND EQUIPMENT
Cost	$ 438	$ 437
Accumulated Depreciation	(150)	(139)
Net Book Value	288	298
Pipeline
PLANT, PROPERTY AND EQUIPMENT
Cost	292	290
Accumulated Depreciation	(117)	(110)
Net Book Value	175	180
Compression
PLANT, PROPERTY AND EQUIPMENT
Cost	103	105
Accumulated Depreciation	(22)	(20)
Net Book Value	81	85
Metering and other
PLANT, PROPERTY AND EQUIPMENT
Cost	43	42
Accumulated Depreciation	(11)	(9)
Net Book Value	$ 32	$ 33

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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