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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic EPS Calculation        
Earnings available to common stockholders - basic $ 21,369 $ 35,465 $ 15,625 $ (5,500)
Weighted-average number of common shares outstanding (in shares) 1,873 1,931 1,916  
Add: deferred awards held as stock units (in shares) 0 0 0  
Total weighted-average number of common shares outstanding (in shares) 1,873 1,931 1,916  
Earnings per share of common stock - basic (in dollars per share) $ 11.41 $ 18.36 $ 8.15  
Diluted EPS Calculation        
Earnings available to common stockholders - diluted $ 21,369 $ 35,465 $ 15,625  
Weighted-average number of common shares outstanding (in shares) 1,873 1,931 1,916  
Add: deferred awards held as stock units (in shares) 0 0 0  
Add: dilutive effect of employee stock-based awards (in shares) 7 9 4  
Total weighted-average number of common shares outstanding (in shares) 1,880 1,940 1,920  
Earnings per share of common stock - diluted (in dollars per share) $ 11.36 $ 18.28 $ 8.14