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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified |  |  | 0 Months Ended | 3 Months Ended |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Apr. 29, 2011 Rainbow pipeline bbl | Mar. 31, 2013 Rainbow pipeline | Feb. 26, 2013 Rainbow pipeline item | Jun. 07, 2012 Rangeland Pipeline Release bbl | Mar. 31, 2013 Rangeland Pipeline Release charge | Feb. 05, 2013 Bay Springs Pipeline bbl | Mar. 31, 2013 Minimum | Mar. 31, 2013 Maximum | Mar. 31, 2013 Maximum Bay Springs Pipeline
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) |  |  | 28,000 |  |  | 3,000 |  | 125 |  |  |
Total estimated cost to clean up and remediate the site, before insurance recoveries |  |  |  | $ 70 |  |  | $ 45 |  |  |  | $ 10
Charges issued |  |  |  |  |  |  | 0 |  |  |  |
Penalty or fines paid |  |  |  |  |  |  | 0 |  |  |  |
Number of enforcement actions |  |  |  |  | 4 |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |
Estimated environmental reserve | 101 | 96 |  |  |  |  |  |  |  |  |
Reserve for environmental liabilities, short-term | 16 | 13 |  |  |  |  |  |  |  |  |
Reserve for environmental liabilities, long-term | 85 | 83 |  |  |  |  |  |  |  |  |
Probable recoveries from insurers and third parties recorded as a receivable | $ 16 | $ 42 |  |  |  |  |  |  |  |  |
Actual cash expenditures for environmental liabilities, period paid |  |  |  |  |  |  |  |  | 3 years | 5 years |

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