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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified |  |  | 9 Months Ended | 1 Months Ended | 30 Months Ended |  | 1 Months Ended | 16 Months Ended |  | 1 Months Ended | 9 Months Ended | 2 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Minimum | Sep. 30, 2013 Maximum | Apr. 30, 2011 Rainbow pipeline bbl | Sep. 30, 2013 Rainbow pipeline | Feb. 26, 2013 Rainbow pipeline item | Jun. 30, 2012 Rangeland Pipeline Release bbl | Sep. 30, 2013 Rangeland Pipeline Release | Jul. 04, 2013 Rangeland Pipeline Release item | Feb. 28, 2013 Bay Springs Pipeline bbl | Sep. 30, 2013 Bay Springs Pipeline | Jun. 30, 2013 Kemp River Pipeline Release item bbl | Sep. 30, 2013 Kemp River Pipeline Release
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated environmental reserve | $ 99 | $ 96 |  |  |  |  |  |  |  |  |  |  |  |
Reserve for environmental liabilities, short-term | 13 | 13 |  |  |  |  |  |  |  |  |  |  |  |
Reserve for environmental liabilities, long-term | 86 | 83 |  |  |  |  |  |  |  |  |  |  |  |
Probable recoveries from insurers and third parties recorded as a receivable | 10 | 42 |  |  |  |  |  |  |  |  |  |  |  |
Actual cash expenditures for environmental liabilities, period paid |  |  | 3 years | 5 years |  |  |  |  |  |  |  |  |  |
Total estimated cost to clean up and remediate the site, before insurance recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  | 15
Total cost to clean up and remediate the site, before insurance recoveries |  |  |  |  |  | 70 |  |  | 46 |  |  | 6 |  |
Estimated size of release (in barrels) |  |  |  |  | 28,000 |  |  | 3,000 |  |  | 120 |  | 700 |
Penalty or fines assessed |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Number of enforcement actions |  |  |  |  |  |  | 4 |  |  | 4 |  |  |  |
Number of events occurred |  |  |  |  |  |  |  |  |  |  |  |  | 2 |

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