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Commitments and Contingencies - Legal, Environmental or Regulatory (Details)
 1 Months Ended 25 Months Ended 56 Months Ended
Oct. 07, 2019
count
Jul. 31, 2019
USD ($)
May 31, 2015
bbl
May 31, 2018
count
Dec. 31, 2019
USD ($)
lawsuit
Apr. 25, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 07, 2018
count
May 16, 2016
count
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities         $ 140,000,000   $ 135,000,000    
Amounts probable of recovery under insurance and from third parties under indemnification agreements         72,000,000   61,000,000    
Other current liabilities                  
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities, short-term         60,000,000   43,000,000    
Other long-term liabilities and deferred credits                  
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities, long-term         80,000,000   92,000,000    
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         35,000,000   28,000,000    
Other long-term assets, net                  
Legal, Environmental or Regulatory Matters                  
Amounts probable of recovery under insurance and from third parties under indemnification agreements         37,000,000   $ 33,000,000    
Line 901 Incident                  
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities         83,000,000        
Amounts probable of recovery under insurance and from third parties under indemnification agreements         62,000,000        
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         390,000,000        
Recoveries from insurance carriers         203,000,000        
Total release costs probable of recovery         265,000,000        
Line 901 Incident | Other current liabilities                  
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities, short-term         50,000,000        
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         $ 28,000,000        
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       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  
Fines or penalties assessed           $ 3,350,000      
Indictment number of felony charges jury deadlocked later dismissed | 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 | Unitholder Derivative Lawsuits                  
Legal, Environmental or Regulatory Matters                  
Number of cases filed during the period | lawsuit         4        
San Joaquin Valley Air Pollution Control District                  
Legal, Environmental or Regulatory Matters                  
Fines or penalties assessed   $ 597,000              
Reduced fine paid   $ 275,000              
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