Commitments and Contingencies (Details)				1 Months Ended	23 Months Ended
	May 16, 2016 count employee	Jan. 06, 2016 occasion	Jan. 01, 2015 bbl	May 31, 2015 bbl	Mar. 31, 2017 USD ($) lawsuit	Dec. 31, 2016 USD ($)	Apr. 30, 2015 violation
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					$ 139,000,000	$ 147,000,000
Estimated undiscounted reserve for environmental liabilities, short-term					59,000,000	61,000,000
Estimated undiscounted reserve for environmental liabilities, long-term					80,000,000	86,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					47,000,000	56,000,000
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					34,000,000	39,000,000
Other long-term assets, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements					13,000,000	$ 17,000,000
Line 901 Incident
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					68,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					41,000,000
Estimated size of release (in bbl) | bbl				2,934
Estimated size of release to reach Pacific Ocean (in bbl) | bbl				598
Fines or penalties assessed					0
Aggregate total estimated costs					280,000,000
Recoveries from insurance carriers					156,000,000
Total release costs probable of recovery					197,000,000
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					29,000,000
Line 901 Incident | Accounts payable and accrued liabilities
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities, short-term					$ 48,000,000
Line 901 Incident | May 2016 Indictment
Legal, Environmental or Regulatory Matters
Number of employees charged | employee	1
Total counts included in the indictment | count	46
Number of misdemeanor charges relating to wildlife allegedly taken | count	36
Number of counts relating to the release of crude oil or reporting of the release | count	10
Number of felony charges | count	3
Number of misdemeanor charges relating to the release of crude oil or reporting of the release | count	7
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					4
Number of cases consolidated into a single proceeding | lawsuit					2
Number of remaining lawsuits | lawsuit					2
Line 901 Incident | Production of Books And Records Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit					2
In the Matter of Bakersfield Crude Terminal LLC et al
Legal, Environmental or Regulatory Matters
Fines or penalties assessed					$ 0
Number of alleged rule violations | violation							10
Mesa to Basin Pipeline
Legal, Environmental or Regulatory Matters
Estimated size of release (in bbl) | bbl			500
Mesa to Basin Pipeline | PHMSA
Legal, Environmental or Regulatory Matters
Fines or penalties assessed					$ 184,300
Number of occasions of alleged failure to carry out damage prevention program and other procedures | occasion		4