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Commitments and Contingencies (Details)					1 Months Ended	15 Months Ended	17 Months Ended
Commitments and Contingencies (Details)	May 16, 2016 item employee	Jan. 06, 2016 USD ($) item	Jul. 10, 2015 bbl	Jan. 01, 2015 bbl	May 31, 2015 bbl	Sep. 30, 2016 USD ($) lawsuit	Sep. 30, 2016 USD ($) lawsuit	Dec. 31, 2015 USD ($)	Apr. 30, 2015 item
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities						$ 160,000,000	$ 160,000,000	$ 185,000,000
Estimated undiscounted reserve for environmental liabilities, short-term						57,000,000	57,000,000	81,000,000
Estimated undiscounted reserve for environmental liabilities, long-term						103,000,000	103,000,000	104,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements						79,000,000	79,000,000	161,000,000
Trade accounts receivable and other receivables, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements						57,000,000	57,000,000	138,000,000
Other long-term assets, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements						22,000,000	22,000,000	$ 23,000,000
Line 901 Incident
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities						87,000,000	87,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements						68,000,000	68,000,000
Aggregate total estimated costs						280,000,000	280,000,000
Recoveries from insurance carriers							129,000,000
Total release costs probable of recovery						197,000,000	197,000,000
Fines or penalties assessed						0	0
Line 901 Incident \| Trade accounts receivable and other receivables, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements						48,000,000	48,000,000
Line 901 Incident \| Accounts payable and accrued liabilities
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities, short-term						47,000,000	$ 47,000,000
Line 901 Incident \| Maximum
Legal, Environmental or Regulatory Matters
Estimated size of release \| bbl					2,935
Line 901 Incident \| May 2016 Indictment
Legal, Environmental or Regulatory Matters
Number of employees charged \| employee	1
Total counts included in the indictment \| item	46
Number of misdemeanor charges relating to wildlife allegedly taken \| item	36
Number of counts relating to the release of crude oil or reporting of the release \| item	10
Number of felony charges \| item	4
Number of misdemeanor charges relating to the release of crude oil or reporting of the release \| item	6
Line 901 Incident \| Class Action Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period \| lawsuit							9
Number of cases consolidated into a single proceeding \| lawsuit							6
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
Number of cases consolidated into a single proceeding \| lawsuit							2
Number of actions resulting from consolidation of separate cases \| lawsuit							1
Line 901 Incident \| Production of Books And Records Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period \| lawsuit							2
MP 29 Release
Legal, Environmental or Regulatory Matters
Estimated size of release \| 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 \| 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