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Commitments and Contingencies - Legal, Environmental or Regulatory (Details)
 1 Months Ended 25 Months Ended 44 Months Ended
May 16, 2016
count
employee
May 31, 2015
bbl
May 31, 2018
count
Dec. 31, 2018
USD ($)
count
lawsuit
Nov. 28, 2018
USD ($)
Sep. 07, 2018
count
Dec. 31, 2017
USD ($)
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       $ 135,000,000     $ 162,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements       61,000,000     55,000,000
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       28,000,000     29,000,000
Other long-term assets, net              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements       33,000,000     26,000,000
Other current liabilities              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, short-term       43,000,000     72,000,000
Other long-term liabilities and deferred credits              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities, long-term       92,000,000     $ 90,000,000
Bluewater NOPV              
Legal, Environmental or Regulatory Matters              
Fines or penalties assessed         $ 109,400    
Line 901 Incident              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       76,000,000      
Amounts probable of recovery under insurance and from third parties under indemnification agreements       53,000,000      
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       355,000,000      
Recoveries from insurance carriers       187,000,000      
Total release costs probable of recovery       240,000,000      
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       22,000,000      
Line 901 Incident | Other current liabilities              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       $ 33,000,000      
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     15      
Number of counts dismissed | count     31        
Number of felony charges dismissed | count     1        
Number of felony charges 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 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           1  
Number of misdemeanor charges dropped | count           2  
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      
United States | Line 901 Incident | Unitholder Derivative Lawsuits              
Legal, Environmental or Regulatory Matters              
Number of cases filed during the period | lawsuit       2      
Texas | Line 901 Incident | Unitholder Derivative Lawsuits              
Legal, Environmental or Regulatory Matters              
Number of lawsuits dismissed | lawsuit       1