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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Settoon Towing, LLC | Aug. 31, 2012 Eagle Ford Pipeline LLC | Dec. 31, 2012 Eagle Ford Pipeline LLC | Dec. 31, 2013 Eagle Ford Pipeline LLC | Aug. 31, 2012 Eagle Ford Pipeline LLC Enterprise Products Partners | Dec. 31, 2012 Eagle Ford Pipeline LLC Enterprise Products Partners | Dec. 31, 2013 White Cliffs Pipeline, LLC | Dec. 31, 2013 Frontier Pipeline Company | Dec. 31, 2013 Butte Pipe Line Company
Equity Method of Accounting |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  | 50.00% |  |  | 50.00% |  |  | 36.00% | 22.00% | 22.00%
Contribution to entity's equity method investees | $ 133 | $ 76 |  |  |  | $ 75 |  |  | $ 75 |  |  |
Contributed assets |  |  |  |  | 134 |  |  | 15 |  |  |  |
Cash received upon formation of equity-method investment |  | 59 |  |  | 59 |  |  |  |  |  |  |
Distributions received from equity method investees | 55 | 40 | 23 |  |  |  |  |  |  |  |  |
Asset Retirement Obligations |  |  |  |  |  |  |  |  |  |  |  |
Fair value of asset retirement obligations | $ 34 | $ 31 |  |  |  |  |  |  |  |  |  |

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