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Commitments and Contingencies Legal, Environmental or Regulatory (Details)
 1 Months Ended 29 Months Ended 41 Months Ended
May 16, 2016
employee
count
May 31, 2015
bbl
Sep. 30, 2018
USD ($)
count
Sep. 30, 2018
USD ($)
count
lawsuit
Sep. 07, 2018
count
Dec. 31, 2017
USD ($)
Legal, Environmental or Regulatory Matters            
Estimated undiscounted reserve for environmental liabilities     $ 126,000,000 $ 126,000,000   $ 162,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements     49,000,000 49,000,000   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     23,000,000 23,000,000   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     26,000,000 26,000,000   26,000,000
Accounts payable and accrued liabilities            
Legal, Environmental or Regulatory Matters            
Estimated undiscounted reserve for environmental liabilities, short-term     46,000,000 46,000,000   72,000,000
Other long-term liabilities and deferred credits            
Legal, Environmental or Regulatory Matters            
Estimated undiscounted reserve for environmental liabilities, long-term     80,000,000 80,000,000   $ 90,000,000
Line 901 Incident            
Legal, Environmental or Regulatory Matters            
Estimated undiscounted reserve for environmental liabilities     65,000,000 65,000,000    
Amounts probable of recovery under insurance and from third parties under indemnification agreements     40,000,000 40,000,000    
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 0    
Aggregate total estimated costs     335,000,000 335,000,000    
Recoveries from insurance carriers       180,000,000    
Total release costs probable of recovery     220,000,000 220,000,000    
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     16,000,000 16,000,000    
Line 901 Incident | Accounts payable and accrued liabilities            
Legal, Environmental or Regulatory Matters            
Estimated undiscounted reserve for environmental liabilities, short-term     $ 37,000,000 $ 37,000,000    
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 15    
Number of felony discharges found guilty | count         1  
Number of misdemeanor charges found guilty | count         8  
Number of misdemeanor charges found guilty, reporting count | count         1  
Number of misdemeanor charges found guilty, strict liability discharge count | count         1  
Number of misdemeanor charges found guilty, strict liability animal takings count | count         6  
Number of misdemeanor charges found not guilty, strict liability animal takings count | 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 charges dropped | count         2  
Total number of counts dismissed | count     31      
Number of felony charges dismissed | count     1      
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 lawsuits dismissed | lawsuit       2    
TEXAS | Line 901 Incident | Unitholder Derivative Lawsuits            
Legal, Environmental or Regulatory Matters            
Number of lawsuits dismissed | lawsuit       1