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Acquisitions and Dispositions - Schedule of Supplemental Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pro Forma Combined        
Operating revenues and other income $ 13,604 $ 14,866 $ 42,216 $ 43,267
Income (loss) before income taxes   4,100   12,024
Net Income (Loss) $ 2,059 $ 2,798 $ 6,939 $ 7,950
Earnings Per Share [Abstract]        
Basic (in dollars per share) $ 1.77 $ 2.33 $ 5.92 $ 6.56
Diluted (in dollars per share) $ 1.76 $ 2.32 $ 5.91 $ 6.54
Pro Forma        
Pro Forma Combined        
Operating revenues and other income   $ 15,563   $ 45,256
Income (loss) before income taxes   4,369   12,522
Net Income (Loss)   $ 3,002   $ 8,328
Earnings Per Share [Abstract]        
Basic (in dollars per share)   $ 2.50   $ 6.87
Diluted (in dollars per share)   $ 2.49   $ 6.85
Surmont        
Pro Forma Combined        
Pro forma = total revenues and other income   $ 697   $ 1,989
Pro forma - Income (loss) before income taxes   269   498
Pro forma - Net income (loss)   $ 204   $ 378