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Commitments and Contingencies - Legal, Environmental or Regulatory (Details)
 1 Months Ended 20 Months Ended 32 Months Ended
May 16, 2016
count
employee
Jan. 06, 2016
occasion
Jan. 01, 2015
bbl
May 31, 2015
bbl
Dec. 31, 2017
USD ($)
count
Dec. 31, 2017
USD ($)
count
lawsuit
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Legal, Environmental or Regulatory Matters                
Estimated undiscounted reserve for environmental liabilities         $ 162,000,000 $ 162,000,000   $ 147,000,000
Amounts probable of recovery under insurance and from third parties under indemnification agreements         55,000,000 55,000,000   56,000,000
Trade Accounts Receivable And Other Receivables                
Legal, Environmental or Regulatory Matters                
Amounts probable of recovery under insurance and from third parties under indemnification agreements         29,000,000 29,000,000   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         26,000,000 26,000,000   17,000,000
Accounts Payable and Accrued Liabilities                
Legal, Environmental or Regulatory Matters                
Estimated undiscounted reserve for environmental liabilities, short-term         72,000,000 72,000,000   61,000,000
Other long-term liabilities and deferred credits                
Legal, Environmental or Regulatory Matters                
Estimated undiscounted reserve for environmental liabilities, long-term         90,000,000 90,000,000   $ 86,000,000
Line 901 Incident                
Legal, Environmental or Regulatory Matters                
Estimated undiscounted reserve for environmental liabilities         94,000,000 94,000,000    
Amounts probable of recovery under insurance and from third parties under indemnification agreements         47,000,000 47,000,000    
Estimated size of release (in barrels) | 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           174,000,000    
Total release costs probable of recovery from insurance carriers         220,000,000 220,000,000    
Line 901 Incident | Trade Accounts Receivable And Other Receivables                
Legal, Environmental or Regulatory Matters                
Amounts probable of recovery under insurance and from third parties under indemnification agreements         22,000,000 22,000,000    
Line 901 Incident | Accounts Payable and Accrued Liabilities                
Legal, Environmental or Regulatory Matters                
Estimated undiscounted reserve for environmental liabilities         $ 62,000,000 $ 62,000,000    
Line 901 Incident | May 2016 Indictment                
Legal, Environmental or Regulatory Matters                
Number of employees charged in indictment | employee 1              
Total number of counts | count 46       13 13    
Total number of counts dismissed | count         33      
Number of felony charges dismissed | count         1      
Number of misdemeanor charges relating to wildlife | count 7              
Number of counts related to the release of crude oil or reporting of the release | count 6              
Number of felony charges | 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 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    
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 | occasion   4            
Fines or penalties assessed             $ 184,300  
United States | Line 901 Incident | Unitholder Derivative Lawsuits                
Legal, Environmental or Regulatory Matters                
Number of cases filed during the period | lawsuit           2