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Operating Segments and Geographic Data (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) $ (48) $ (1,729) $ 132
Operating Segments | Upstream      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (1,289) (1,006) (827)
Operating Segments | Upstream | United States      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (3,538) (1,172) (2,041)
Operating Segments | Upstream | International      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 2,249 166 1,214
Operating Segments | Downstream      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 231 987 2,633
Operating Segments | Downstream | United States      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (419) 503 1,320
Operating Segments | Downstream | International      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 650 484 1,313
All Other      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) $ 1,010 $ (1,710) $ (1,674)