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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d + Details
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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c + Details
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