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Acquisitions (Details) (Southern Pines Acquisition, USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	May 31, 2011	Jun. 30, 2011 Y	Feb. 28, 2011 StorageCaverns	Feb. 09, 2011
Southern Pines Acquisition
Business acquisition
Ownership interest (as a percent)			100.00%
Purchase price				$ 752
Tax abatement included in amortizable intangible assets		15
Contracts value included in amortizable intangible assets		77
Intangible assets, useful life
Average Depreciable Life, Minimum (in years)		2
Average Depreciable Life, maximum (in years)		10
Future amortization expense remainder fiscal year		13
Future amortization expense first full fiscal year		14
Future amortization expense second full fiscal year		13
Future amortization expense third full fiscal year		11
Future amortization expense fourth full fiscal year		8
Business acquisition, allocation of fair value of assets and liabilities
Inventory		14
Property and equipment, net		341
Base Gas		3
Other working capital, net of cash acquired		1
Intangible assets		92
Goodwill		301
Total assets and liabilities		752
Property and equipment, useful life
Average Depreciable Life, minimum (in years)		5
Average Depreciable Life, Maximum (in years)		70
Acquisition-related costs incurred		4
Percentage of remaining purchase price (as a percent)	5.00%
Escrowed purchase price	37
Adjustment amount received	$ 10

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The amount of acquisition cost of a business combination allocated to base gas.

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The amount of acquisition cost of a business combination allocated to working capital net of cash acquired.

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The amount of amortization expense expected to be recognized during the first full fiscal year following the date of the most recent balance sheet.

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The amount of amortization expense expected to be recognized during the fourth full fiscal year following the date of the most recent balance sheet.

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The amount of amortization expense expected to be recognized during the second full fiscal year following the date of the most recent balance sheet.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Percentage of voting equity interests acquired in the business combination.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The amount of acquisition cost of a business combination allocated to inventory, including finished goods, work-in-process, and raw materials.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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The net amount recognized as of the acquisition date for the aggregate assets, including goodwill, in excess of or less than the aggregate liabilities assumed. This amount may also be viewed as the incremental amount of equity that the consolidated entity (including the portion attributable to the noncontrolling interest) will recognize as a result of the business combination.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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