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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]      
Net of provision for income taxes on discontinued operations $ 0 $ 0 $ 5,000,000
Guarantor Subsidiaries [Member]      
Condensed Financial Statements, Captions [Line Items]      
Percentage of ownership In subsidiary 100.00%    
Senior Notes | Phillips 66      
Condensed Financial Statements, Captions [Line Items]      
Senior notes $ 7,500,000,000.0