v3.8.0.1
Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2017
Feb. 15, 2018
Jun. 30, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name ANDEAVOR LOGISTICS LP    
Entity Central Index Key 0001507615    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus Q4    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 3.8
Limited Partners' Capital Account, Units Issued   217,164,424