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Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Settoon Towing, LLC | Aug. 31, 2012 Eagle Ford Pipeline LLC | Dec. 31, 2012 Eagle Ford Pipeline LLC bbl mi | Aug. 31, 2012 Eagle Ford Pipeline LLC Enterprise Product Partners | Dec. 31, 2012 Eagle Ford Pipeline LLC Enterprise Product Partners | Dec. 31, 2012 White Cliffs Pipeline, LLC | Dec. 31, 2012 Frontier Pipeline Company | Dec. 31, 2012 Butte Pipe Line Company
Equity Method of Accounting |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 50.00% |  | 50.00% |  |  | 36.00% | 22.00% | 22.00%
Crude oil and condensate pipeline (in miles) |  |  |  |  | 175 |  |  |  |  |
Volume of operational storage capacity (in barrels) |  |  |  |  | 1,800,000 |  |  |  |  |
Contributed assets |  |  |  | $ 134 |  | $ 15 |  |  |  |
Cash received related to formation of pipeline | 59 |  |  |  | 59 |  |  |  |  |
Contribution to fund continued development of pipeline system | 76 |  |  |  | 75 |  | 75 |  |  |
Asset Retirement Obligations |  |  |  |  |  |  |  |  |  |
Fair value of asset retirement obligations | $ 31 | $ 9 |  |  |  |  |  |  |  |

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