SIGNIFICANT ACCOUNTING POLICIES (Details 2)	12 Months Ended
Dec. 31, 2011 Y
Pipeline and compression
PLANT, PROPERTY AND EQUIPMENT
Estimated useful life, minimum (in years)	20
Estimated useful life, maximum (in years)	30
Metering and other
PLANT, PROPERTY AND EQUIPMENT
Estimated useful life, minimum (in years)	5
Estimated useful life, maximum (in years)	30

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration