Commitments and Contingencies - Legal, Environmental or Regulatory (Details)				1 Months Ended	20 Months Ended
	May 16, 2016 employee item	Jan. 06, 2016 USD ($) occasion	Jan. 01, 2015 bbl	May 31, 2015 bbl	Dec. 31, 2016 USD ($) lawsuit	Dec. 31, 2015 USD ($)	Apr. 30, 2015 violation
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					$ 147,000,000	$ 185,000,000
Estimated undiscounted reserve for environmental liabilities, short-term					61,000,000	81,000,000
Estimated undiscounted reserve for environmental liabilities, long-term					86,000,000	104,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					56,000,000	161,000,000
Line 901 Incident
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					75,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					49,000,000
Fines or penalties assessed					0
Aggregate total estimated costs (less than $10 million)					280,000,000
Recoveries from insurance carriers					148,000,000
Total release costs probable of recovery					$ 197,000,000
Line 901 Incident | Maximum
Legal, Environmental or Regulatory Matters
Estimated size of release (in barrels) | bbl				2,935
Line 901 Incident | Class Action Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit					9
Number of claims administratively 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
Loss Contingency, Claims Not Consolidated, Number | lawsuit					2
Line 901 Incident | Compliance with Regulations and Other Matters
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit					2
Line 901 Incident | Indictment In California Superior Court Santa Barbara County
Legal, Environmental or Regulatory Matters
Number of employees charged in indictment | employee	1
Total number of counts | item	46
Number of misdemeanor charges relating to wildlife | item	36
Number of counts related to the release of crude oil or reporting of the release | item	10
Number of felony charges | item	4
Number of misdemeanor charges related to the release of crude oil or reporting of the release | item	6
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 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 | occasion		4
Fines or penalties recommended		$ 190,000
Trade accounts receivable and other receivables
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements					39,000,000	138,000,000
Trade accounts receivable and other receivables | Line 901 Incident
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements					34,000,000
Other long-term assets, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements					17,000,000	$ 23,000,000
Accounts payable and accrued liabilities | Line 901 Incident
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					$ 50,000,000
United States | Line 901 Incident | Unitholder Derivative Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit					2