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Earnings and Dividends Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Computations for Basic and Diluted Income (Loss) Per Common Share from Continuing Operations
The computations for basic and diluted earnings (loss) per common share from continuing operations are as follows:
 
 
Three Months Ended March 31,
(Dollars in millions, except per share amounts)
 
2018
 
2017
Earnings (loss) attributable to United States Steel Corporation stockholders
 
$
18

 
$
(180
)
Weighted-average shares outstanding (in thousands):
 

 

Basic
 
176,157

 
174,242

Effect of stock options, restricted stock units and performance awards
 
2,132

 

Adjusted weighted-average shares outstanding, diluted
 
178,289

 
174,242

Basic earnings (loss) per common share
 
$
0.10

 
$
(1.03
)
Diluted earnings (loss) per common share
 
$
0.10

 
$
(1.03
)
Antidilutive Securities that were Not Included in Computations of Diluted Income (Loss) Per Common Share
The following table summarizes the securities that were antidilutive, and therefore, were not included in the computations of diluted earnings (loss) per common share:
 
 
Three Months Ended March 31,
(In thousands)
 
2018
 
2017
Securities granted under the 2016 Omnibus Incentive Compensation Plan, as amended
 
1,982

 
8,162