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Variable Interest Entities (VIEs) (Details) - Phillips 66 Partners - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Equity investments    
Variable Interest Entity [Line Items]    
Variable interest entity consolidated, assets, noncurrent, pledged $ 1,142 $ 945
Net properties, plants and equipment    
Variable Interest Entity [Line Items]    
Variable interest entity consolidated, assets, noncurrent, pledged $ 2,675 $ 2,437