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Income per Common Share
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Income (Loss) per Common Share
Loss) per Common Share
Basic income (loss) per share is based on the weighted average number of common shares outstanding.  Diluted income per share assumes exercise of stock options, provided the effect is not antidilutive. The per share calculations below exclude 14 million stock options for the three and six month periods ended June 30, 2016 and 13 million stock options for the three and six month periods ended June 30, 2015 that were antidilutive.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In millions, except per share data)
2016
 
2015
 
2016
 
2015
Net income (loss)
$
(170
)
 
$
(386
)
 
$
(577
)
 
$
(662
)
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
848

 
677

 
790

 
676

Weighted average common shares, diluted
848

 
677

 
790

 
676

Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
(0.20
)
 
$
(0.57
)
 
$
(0.73
)
 
$
(0.98
)
Diluted
$
(0.20
)
 
$
(0.57
)
 
$
(0.73
)
 
$
(0.98
)