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Income Taxes - Out of Period Adjustment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Oct. 01, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Provision for income taxes $ 104 $ 22    
Goodwill 20,229   $ 20,184  
Andeavor        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Goodwill       $ 16,380
Andeavor | Adjustments        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Provision for income taxes 36      
Deferred tax liabilities 68      
Goodwill $ 32     $ 66