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Earnings and Dividends Per Common Share - Computations for Basic and Diluted Income (Loss) Per Common Share from Continuing Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Earnings attributable to United States Steel Corporation stockholders $ 882 $ 91
Weighted-average shares outstanding (in thousands):    
Basic (in shares) 261,453 249,351
Effect of Senior Convertible Notes (in shares) 26,194 8,467
Effect of stock options, restricted stock units and performance awards (in shares) 5,620 4,151
Adjusted weighted-average shares outstanding, diluted (in shares) 293,267 261,969
Basic (loss) earnings per common share (in dollars per share) $ 3.37 $ 0.36
Diluted (loss) earnings per common share (in dollars per share) $ 3.02 $ 0.35