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Commitments and Contingencies - Legal, Environmental or Regulatory (Details)
 1 Months Ended 12 Months Ended 14 Months Ended
May 16, 2016
employee
item
Jan. 06, 2016
USD ($)
item
Jul. 10, 2015
bbl
Jan. 01, 2015
bbl
May 31, 2015
bbl
Jun. 30, 2016
USD ($)
lawsuit
Jun. 30, 2016
USD ($)
lawsuit
Dec. 31, 2015
USD ($)
Apr. 30, 2015
item
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities           $ 160,000,000 $ 160,000,000 $ 185,000,000  
Estimated undiscounted reserve for environmental liabilities, short-term           59,000,000 59,000,000 81,000,000  
Estimated undiscounted reserve for environmental liabilities, long-term           101,000,000 101,000,000 104,000,000  
Amounts probable of recovery under insurance and from third parties under indemnification agreements           68,000,000 68,000,000 161,000,000  
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           46,000,000 46,000,000 138,000,000  
Other long-term assets, net                  
Legal, Environmental or Regulatory Matters                  
Amounts probable of recovery under insurance and from third parties under indemnification agreements           22,000,000 22,000,000 $ 23,000,000  
Line 901 Incident                  
Legal, Environmental or Regulatory Matters                  
Aggregate total estimated costs           269,000,000 269,000,000    
Estimated undiscounted reserve for environmental liabilities           91,000,000 91,000,000    
Recoveries from insurance carriers             124,000,000    
Total release costs probable of recovery           186,000,000 186,000,000    
Amounts probable of recovery under insurance and from third parties under indemnification agreements           62,000,000 62,000,000    
Fines or penalties assessed           0 0    
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           42,000,000 42,000,000    
Line 901 Incident | Accounts payable and accrued liabilities                  
Legal, Environmental or Regulatory Matters                  
Estimated undiscounted reserve for environmental liabilities           51,000,000 $ 51,000,000    
Line 901 Incident | May 2016 Indictment                  
Legal, Environmental or Regulatory Matters                  
Number of employees charged | employee 1                
Total counts included in the indictment | item 46                
Number of misdemeanor charges relating to wildlife allegedly taken | item 36                
Number of counts relating to the release of crude oil or reporting of the release | item 10                
Number of felony charges | item 4                
Number of misdemeanor charges relating to the release of crude oil or reporting of the release | item 6                
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             7    
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             3    
Number of cases consolidated into a single proceeding | lawsuit             2    
Number of actions resulting from consolidation of separate cases | lawsuit             1    
Line 901 Incident | Production of Books And Records Lawsuits                  
Legal, Environmental or Regulatory Matters                  
Number of cases filed during the period | lawsuit             2    
Line 901 Incident | Worst Case Estimate                  
Legal, Environmental or Regulatory Matters                  
Estimated size of release (in barrels) | bbl         2,935        
MP 29 Release                  
Legal, Environmental or Regulatory Matters                  
Estimated size of release (in barrels) | bbl     100            
Fines or penalties assessed           0 $ 0    
MP 29 Release | Maximum                  
Legal, Environmental or Regulatory Matters                  
Aggregate total estimated costs           $ 10,000,000 10,000,000    
MP 29 Release | Class Action Lawsuits                  
Legal, Environmental or Regulatory Matters                  
Number of cases filed during the period | lawsuit           1      
In the Matter of Bakersfield Crude Terminal LLC et al                  
Legal, Environmental or Regulatory Matters                  
Number of alleged rule violations | item                 10
Fines or penalties assessed           $ 0 $ 0    
Mesa to Basin Pipeline                  
Legal, Environmental or Regulatory Matters                  
Estimated size of release (in barrels) | bbl       500          
Mesa to Basin Pipeline | PHMSA                  
Legal, Environmental or Regulatory Matters                  
Number of occasions of alleged failure to carry out damage prevention program and other procedures | item   4              
Fines or penalties recommended   $ 190,000