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Commitments and Contingencies (Details)
 1 Months Ended 29 Months Ended
May 16, 2016
employee
count
May 31, 2015
bbl
Sep. 30, 2017
USD ($)
lawsuit
Dec. 31, 2016
USD ($)
Legal, Environmental or Regulatory Matters        
Estimated undiscounted reserve for environmental liabilities     $ 134,000,000 $ 147,000,000
Estimated undiscounted reserve for environmental liabilities, short-term     47,000,000 61,000,000
Estimated undiscounted reserve for environmental liabilities, long-term     87,000,000 86,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements     47,000,000 56,000,000
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     26,000,000 39,000,000
Other long-term assets, net        
Legal, Environmental or Regulatory Matters        
Amounts probable of recovery under insurance and from third parties under indemnification agreements     21,000,000 $ 17,000,000
Line 901 Incident        
Legal, Environmental or Regulatory Matters        
Estimated undiscounted reserve for environmental liabilities     64,000,000  
Amounts probable of recovery under insurance and from third parties under indemnification agreements     39,000,000  
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     300,000,000  
Recoveries from insurance carriers     166,000,000  
Total release costs probable of recovery     205,000,000  
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     18,000,000  
Line 901 Incident | Accounts payable and accrued liabilities        
Legal, Environmental or Regulatory Matters        
Estimated undiscounted reserve for environmental liabilities, short-term     $ 36,000,000  
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      
Number of misdemeanor charges relating to wildlife allegedly taken | count 36      
Number of counts relating to the release of crude oil or reporting of the release | count 10      
Number of felony charges relating to the release of crude oil or reporting of the release | count 3      
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  
Number of cases consolidated into a single proceeding | lawsuit     2  
Number of remaining lawsuits | lawsuit     2