Debt and Financing Arrangement (Notes)	9 Months Ended
Debt and Financing Arrangement (Notes)	Sep. 30, 2014
Debt Disclosure [Abstract]
Debt and Financing Arrangement	DEBT AND FINANCING ARRANGEMENT Credit Facility We, along with WPZ and Transcontinental Gas Pipe Line Company, LLC (Transco), are co-borrowers under a $2.5 billion credit facility. Total letter of credit capacity available to WPZ under the credit facility is $1.3 billion. We may borrow up to $500 million under the credit facility to the extent not otherwise utilized by WPZ and Transco. At September 30, 2014, no letters of credit have been issued and no loans are outstanding under the credit facility. WPZ participates in a commercial paper program, and WPZ management considers amounts outstanding under this program to be a reduction of available capacity under the credit facility. The program allows a maximum outstanding amount at any time of $2 billion of unsecured commercial paper notes. At September 30, 2014, WPZ had $265 million in outstanding commercial paper.

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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