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Income Taxes Components of Net Deferred Tax Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Net Deferred Income Tax [Abstract]      
Total deferred income tax assets $ 909 $ 716  
Deferred Tax Liabilities, Net (3,315) (5,112) $ (4,590)
Goodwill associated with Sunoco Retail to Sunoco LP transaction (see Note 3) 0 460  
Net assets (excluding goodwill) associated with Sunoco Retail to Sunoco LP (see Note 3) 0 243  
Tax provision, including provision from discontinued operations 1,825 201  
Other (28) (20)  
Valuation allowance 189 118  
Net deferred income tax assets $ 720 $ 598