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Commitments and Contingencies - Legal, Environmental or Regulatory (Details)
 1 Months Ended 8 Months Ended 12 Months Ended 20 Months Ended
May 16, 2016
item
employee
Jan. 06, 2016
USD ($)
item
bbl
May 31, 2015
bbl
Dec. 31, 2015
USD ($)
lawsuit
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
lawsuit
Apr. 30, 2015
item
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities       $ 185,000,000 $ 147,000,000 $ 147,000,000  
Estimated undiscounted reserve for environmental liabilities, short-term       81,000,000 61,000,000 61,000,000  
Estimated undiscounted reserve for environmental liabilities, long-term       104,000,000 86,000,000 86,000,000  
Amounts probable of recovery under insurance and from third parties under indemnification agreements       $ 161,000,000 56,000,000 56,000,000  
Line 901 Incident              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities         75,000,000 75,000,000  
Amounts probable of recovery under insurance and from third parties under indemnification agreements         49,000,000 49,000,000  
Fines or penalties assessed         0 0  
Aggregate total estimated costs         280,000,000 280,000,000  
Recoveries from insurance carriers         148,000,000    
Total release costs probable of recovery         197,000,000 $ 197,000,000  
Line 901 Incident | Maximum              
Legal, Environmental or Regulatory Matters              
Estimated size of release (in barrels) | bbl     2,935        
Line 901 Incident | Indictment In California Superior Court Santa Barbara County [Member]              
Legal, Environmental or Regulatory Matters              
Number of employees charged in indictment | employee 1            
Total number of counts | item 46            
Number of misdemeanor charges relating to wildlife | item 36            
Number of counts related to the release of crude oil or reporting of the release | item 10            
Number of felony charges | item 4            
Number of misdemeanor charges related 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 administratively 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  
Claims not consolidated | lawsuit           2  
Line 901 Incident | Compliance with Regulations and Other Matters              
Legal, Environmental or Regulatory Matters              
Number of cases filed during the period | lawsuit           2  
In the Matter of Bakersfield Crude Terminal LLC et al              
Legal, Environmental or Regulatory Matters              
Fines or penalties assessed         0 $ 0  
Number of alleged rule violations | item             10
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          
Trade Accounts Receivable And Other Receivables              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements       $ 138,000,000 39,000,000 39,000,000  
Trade Accounts Receivable And Other Receivables | Line 901 Incident              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements         34,000,000 34,000,000  
Other long-term assets, net              
Legal, Environmental or Regulatory Matters              
Amounts probable of recovery under insurance and from third parties under indemnification agreements       $ 23,000,000 17,000,000 17,000,000  
Accounts Payable and Accrued Liabilities | Line 901 Incident              
Legal, Environmental or Regulatory Matters              
Estimated undiscounted reserve for environmental liabilities         $ 50,000,000 $ 50,000,000  
United States | Line 901 Incident | Unitholder Derivative Lawsuits              
Legal, Environmental or Regulatory Matters              
Number of cases filed during the period | lawsuit           2