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Operating Segments and Geographic Data - Segment Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) $ (1,892) $ 2,691 $ 5,715
Operating Segments | Upstream      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (985) 1,942 5,498
Operating Segments | Upstream | United States      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (570) (1,550) 811
Operating Segments | Upstream | International      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (415) 3,492 4,687
Operating Segments | Downstream      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 61 562 862
Operating Segments | Downstream | United States      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) (192) 392 534
Operating Segments | Downstream | International      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) 253 170 328
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Total Income Tax Expense (Benefit) $ (968) $ 187 $ (645)