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Debt	3 Months Ended
Debt	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	7. Debt Boardwalk Pipeline In February of 2015, Boardwalk Pipeline repaid at maturity the entire $275 million aggregate principal amount of its 5.1% senior notes. In March of 2015, Boardwalk Pipeline completed a public offering of an additional $250 million aggregate principal amount of its 5.0% senior notes due December 15, 2024. Boardwalk Pipeline originally issued $350 million aggregate principal amount of its 5.0% senior notes due December 15, 2024 in November of 2014. Boardwalk Pipeline intends to use the net proceeds from this offering to retire a portion of the outstanding $250 million aggregate principal amount of 4.6% notes due June 1, 2015.

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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