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Acquisitions and Dispositions - Schedule of Supplemental Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pro Forma Combined    
Operating revenues and other income $ 14,476 $ 15,517
Income (loss) before income taxes   4,562
Net Income (Loss) $ 2,551 $ 2,920
Earnings Per Share [Abstract]    
Basic (in dollars per share) $ 2.16 $ 2.38
Diluted (in dollars per share) $ 2.15 $ 2.38
Pro Forma    
Pro Forma Combined    
Operating revenues and other income   $ 16,120
Income (loss) before income taxes   4,632
Net Income (Loss)   $ 2,973
Earnings Per Share [Abstract]    
Basic (in dollars per share)   $ 2.43
Diluted (in dollars per share)   $ 2.42
Surmont    
Pro Forma Combined    
Pro forma = total revenues and other income   $ 603
Pro forma - Income (loss) before income taxes   70
Pro forma - Net income (loss)   $ 53