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Commitments and Contingencies (Details) |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 29 Months Ended | 32 Months Ended |  |  |  |
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Jul. 10, 2015 bbl | Jan. 15, 2015 item | Feb. 28, 2013 bbl | Jun. 30, 2015 bbl | Jun. 30, 2013 item bbl | Sep. 30, 2015 USD ($) item | Sep. 30, 2015 USD ($) bbl | Sep. 30, 2015 USD ($) item | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | May. 22, 2015 USD ($) | Apr. 30, 2015 item | Feb. 28, 2015 CAD | Dec. 31, 2014 USD ($)
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated undiscounted reserve for environmental liabilities |  |  |  |  |  | $ 197,000,000 | $ 197,000,000 | $ 197,000,000 | $ 197,000,000 | $ 197,000,000 |  |  |  | $ 82,000,000
Estimated undiscounted reserve for environmental liabilities, short-term |  |  |  |  |  | 96,000,000 | 96,000,000 | 96,000,000 | 96,000,000 | 96,000,000 |  |  |  | 13,000,000
Estimated undiscounted reserve for environmental liabilities, long-term |  |  |  |  |  | 101,000,000 | 101,000,000 | 101,000,000 | 101,000,000 | 101,000,000 |  |  |  | 69,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements |  |  |  |  |  | 200,000,000 | 200,000,000 | 200,000,000 | 200,000,000 | 200,000,000 |  |  |  | $ 8,000,000
Line 901 Incident |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate total estimated costs |  |  |  |  |  | 257,000,000 | 257,000,000 | 257,000,000 | 257,000,000 | 257,000,000 |  |  |  |
Estimated undiscounted reserve for environmental liabilities |  |  |  |  |  | 126,000,000 | 126,000,000 | 126,000,000 | 126,000,000 | 126,000,000 |  |  |  |
Amounts probable of recovery under insurance and from third parties under indemnification agreements |  |  |  |  |  | 192,000,000 | 192,000,000 | 192,000,000 | 192,000,000 | 192,000,000 |  |  |  |
Fines or penalties assessed |  |  |  |  |  | 0 | $ 0 | $ 0 | 0 | 0 |  |  |  |
Line 901 Incident | Class Action Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases filed during the period | item |  |  |  |  |  |  |  | 7 |  |  |  |  |  |
Line 901 Incident | Securities Law Class Action Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases filed during the period | item |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Line 901 Incident | Initial Worst Case Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl |  |  |  | 2,500 |  |  |  |  |  |  |  |  |  |
Line 901 Incident | Adjusted Worst Case Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl |  |  |  | 2,400 |  |  |  |  |  |  |  |  |  |
Line 901 Incident | Worst Case Estimate, Alternative Methodology Purge Data | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl |  |  |  |  |  |  | 3,400 |  |  |  |  |  |  |
Line 901 Incident | Third Party Engineering and Consulting Firm, Preliminary Worst Case Estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |
MP 29 Release |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl | 100 |  |  |  |  |  |  |  |  |  |  |  |  |
Fines or penalties assessed |  |  |  |  |  | 0 | $ 0 | $ 0 | 0 | 0 |  |  |  |
MP 29 Release | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate total estimated costs |  |  |  |  |  | $ 10,000,000 | 10,000,000 | 10,000,000 | 10,000,000 | 10,000,000 |  |  |  |
MP 29 Release | Class Action Lawsuits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases filed during the period | item |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Cushing Tank Cathodic Protection | PHMSA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fines or penalties assessed |  |  |  |  |  |  |  |  |  |  | $ 102,900 |  |  |
In the Matter of Bakersfield Crude Terminal LLC et al |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of alleged rule violations | item |  |  |  |  |  |  |  |  |  |  |  | 10 |  |
Fines or penalties assessed |  |  |  |  |  | $ 0 | 0 | 0 | 0 | 0 |  |  |  |
Kemp River Pipeline Release |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of events occurred | item |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl |  |  |  |  | 700 |  |  |  |  |  |  |  |  |
Total estimated costs to clean up and remediate the site |  |  |  |  |  | 15,000,000 | 15,000,000 | 15,000,000 | 15,000,000 | 15,000,000 |  |  |  |
Cost incurred, to date, to clean up and remediate the site |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  |
Bay Springs Pipeline Release |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated size of release (in barrels) | bbl |  |  | 120 |  |  |  |  |  |  |  |  |  |  |
Total cost to clean up and remediate the site |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |
PMC | National Energy Board Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of conditions imposed related to regulatory compliance | item |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Fines or penalties assessed | CAD |  |  |  |  |  |  |  |  |  |  |  |  | CAD 76,000 |
PMC | Kemp River Pipeline Release |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fines or penalties assessed |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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