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Operating Segments and Geographic Data - Segement Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) $ 5,715 $ (48) $ (1,729)
Operating Segments | Upstream      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 5,498 (1,289) (1,006)
Operating Segments | Upstream | United States      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 811 (3,538) (1,172)
Operating Segments | Upstream | International      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 4,687 2,249 166
Operating Segments | Downstream      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 862 231 987
Operating Segments | Downstream | United States      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 534 (419) 503
Operating Segments | Downstream | International      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 328 650 484
All Other      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) $ (645) $ 1,010 $ (1,710)