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Earnings and Dividends Per Common Share - Computations for Basic and Diluted Income (Loss) Per Common Share from Continuing Operations (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income (loss) attributable to United States Steel    
Corporation shareholders $ 52 $ (73)
Plus income effect of assumed conversion-interest on convertible notes 2 0
Net income (loss) after assumed conversion $ 54 $ (73)
Weighted-average shares outstanding:    
Basic 144,757 144,353
Effect of convertible notes 10,058 0
Effect of stock options, restricted stock units and performance awards 1,299 0
Adjusted weighted-average shares outstanding, diluted 156,114 144,353
Basic earnings per common share $ 0.36 $ (0.51)
Diluted earnings per common share $ 0.34 $ (0.51)