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Commitments and Contingencies - Legal, Environmental or Regulatory (Details)				1 Months Ended	9 Months Ended	11 Months Ended
	Jan. 06, 2016 USD ($) item	Jul. 10, 2015 bbl	Jan. 01, 2015 bbl	May. 31, 2015 bbl	Mar. 31, 2016 USD ($) lawsuit	Mar. 31, 2016 USD ($) lawsuit	Dec. 31, 2015 USD ($)	Apr. 30, 2015 item
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					$ 176,000,000	$ 176,000,000	$ 185,000,000
Estimated undiscounted reserve for environmental liabilities, short-term					69,000,000	69,000,000	81,000,000
Estimated undiscounted reserve for environmental liabilities, long-term					107,000,000	107,000,000	104,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					81,000,000	81,000,000	$ 161,000,000
Line 901 Incident
Legal, Environmental or Regulatory Matters
Aggregate total estimated costs					269,000,000	269,000,000
Estimated undiscounted reserve for environmental liabilities					104,000,000	104,000,000
Recoveries from insurance carriers						112,000,000
Total release costs probable of recovery					186,000,000	186,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					74,000,000	74,000,000
Fines or penalties assessed					0	$ 0
Line 901 Incident | Class Action Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit						8
Number of cases consolidated into a single proceeding | lawsuit						7
Line 901 Incident | Securities Law Class Action Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit						2
Line 901 Incident | Unitholder Derivative Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit						3
Line 901 Incident | Production of Books And Records Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit						2
Line 901 Incident | Worst Case Estimate
Legal, Environmental or Regulatory Matters
Estimated size of release (in barrels) | bbl				2,935
MP 29 Release
Legal, Environmental or Regulatory Matters
Estimated size of release (in barrels) | bbl		100
Fines or penalties assessed					0	$ 0
MP 29 Release | Maximum
Legal, Environmental or Regulatory Matters
Aggregate total estimated costs					$ 10,000,000	10,000,000
MP 29 Release | Class Action Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit					1
In the Matter of Bakersfield Crude Terminal LLC et al
Legal, Environmental or Regulatory Matters
Number of alleged rule violations | item								10
Fines or penalties assessed					$ 0	$ 0
Mesa to Basin Pipeline
Legal, Environmental or Regulatory Matters
Estimated size of release (in barrels) | bbl			500
Mesa to Basin Pipeline | PHMSA
Legal, Environmental or Regulatory Matters
Number of occasions of alleged failure to carry out damage prevention program and other procedures | item	4
Fines or penalties recommended	$ 190,000

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