Debt and Financing Arrangements	3 Months Ended
Mar. 31, 2013
Debt and Financing Arrangements [Abstract]
DEBT AND FINANCING ARRANGEMENTS	3. DEBT AND FINANCING ARRANGEMENTS. Credit Facility. Total letter of credit capacity available to WPZ under the $2.4 billion credit facility is $1.3 billion. At March 31, 2013, WPZ had a total of $250 million in loans outstanding under the credit facility and no letters of credit have been issued. We may borrow up to $400 million under the credit facility to the extent not otherwise utilized by WPZ and Northwest Pipeline GP. At March 31, 2013, the full $400 million under the credit facility was available to us.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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