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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Business Acquisition [Line Items]
Expected purchase price	$ 550
Expected proceeds from bank loan to be used for acquisition	200
Boardwalk Pipeline [Member]
Business Acquisition [Line Items]
Equity contributions	70
Equity ownership interest	20.00%
BPHC [Member]
Business Acquisition [Line Items]
Equity contributions	$ 280
Equity ownership interest	80.00%

- Definition

The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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