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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of earnings per share
The following table summarizes the calculation of basic and diluted earnings per share:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(millions, except per share amounts)
2015
 
2014
 
2015
 
2014
Net Income (Loss)
$
(109
)
 
$
192

 
$
(131
)
 
$
392

 
 
 
 
 
 
 
 
Weighted Average Number of Shares Outstanding, Basic (1)
387

 
361

 
378

 
361

Incremental Shares from Assumed Conversion of Dilutive Stock Options, Restricted Stock, and Shares of Common Stock in Rabbi Trust (2)
—

 
5

 
—

 
4

Weighted Average Number of Shares Outstanding, Diluted
387

 
366

 
378

 
365

Earnings (Loss) Per Share, Basic
$
(0.28
)
 
$
0.53

 
$
(0.35
)
 
$
1.09

Earnings (Loss) Per Share, Diluted
(0.28
)
 
0.52

 
(0.35
)
 
1.07

Number of Antidilutive Stock Options, Shares of Restricted Stock, and Shares of Common Stock in Rabbi Trust Excluded from Calculation Above
10

 
3

 
9

 
4

(1) 
The weighted average number of shares outstanding includes the weighted average shares of common stock issued in connection with the underwritten public offering of 24,150,000 shares of common stock of the Company in first quarter 2015.
(2) 
For the three and six months ended June 30, 2015, all outstanding options and non-vested restricted shares have been excluded from the calculation of diluted EPS as the Company incurred losses. Therefore, inclusion of outstanding options and non-vested restricted shares in the calculation of diluted EPS would be anti-dilutive.