Commitments and Contingencies - Legal, Environmental or Regulatory (Details) $ in Thousands			1 Months Ended	25 Months Ended	62 Months Ended
	Mar. 13, 2020 USD ($)	Oct. 07, 2019 count	May 31, 2015 bbl	May 31, 2018 count	Jun. 30, 2020 USD ($) lawsuit	Dec. 31, 2019 USD ($)	Apr. 25, 2019 USD ($)	Sep. 07, 2018 count	May 16, 2016 count
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					$ 192,000	$ 140,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					126,000	72,000
Other current liabilities
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities, short-term					148,000	60,000
Other long-term liabilities and deferred credits
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities, long-term					44,000	80,000
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						35,000
Other long-term assets, net
Legal, Environmental or Regulatory Matters
Amounts probable of recovery under insurance and from third parties under indemnification agreements						$ 37,000
Line 901 Incident
Legal, Environmental or Regulatory Matters
Estimated undiscounted reserve for environmental liabilities					140,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements					118,000
Estimated size of release (in bbl) | bbl			2,934
Estimated size of release to reach Pacific Ocean (in bbl) | bbl			598
Aggregate total estimated costs					455,000
Recoveries from insurance carriers					212,000
Total release costs probable of recovery					$ 330,000
Line 901 Incident | May 2016 Indictment
Legal, Environmental or Regulatory Matters
Total counts included in the indictment | count									46
Number of counts dismissed | count				31
Number of felony charges dismissed | count		2		1
Number of felony discharges found guilty | count								1
Number of misdemeanor charges found guilty | count								8
Number of misdemeanor charges found guilty, reporting | count								1
Number of misdemeanor charges found guilty, strict liability discharge | count								1
Number of misdemeanor charges found guilty, strict liability animal takings | count								6
Number of misdemeanor charges found not guilty, strict liability animal takings | count								1
Number of charges jury deadlocked | count								3
Number of charges jury deadlocked, felony discharges | count								2
Number of charges jury deadlocked, strict liability animal takings count | count								1
Number of misdemeanor discharges dropped | count								2
Fines or penalties assessed							$ 3,350
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 | Unitholder Derivative Lawsuits
Legal, Environmental or Regulatory Matters
Number of cases filed during the period | lawsuit					4
Line 901 Incident | Civil Penalties
Legal, Environmental or Regulatory Matters
Loss contingency, damages sought, value	$ 24,000
Line 901 Incident | Compensation for Injuries to, Destruction of, Loss of Use of, Natural Resources
Legal, Environmental or Regulatory Matters
Loss contingency, damages sought, value	$ 22,325
UNITED STATES | Line 901 Incident | Unitholder Derivative Lawsuits
Legal, Environmental or Regulatory Matters
Number of lawsuits dismissed | lawsuit					2
TEXAS | Line 901 Incident | Unitholder Derivative Lawsuits
Legal, Environmental or Regulatory Matters
Number of lawsuits dismissed | lawsuit					1