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Earnings (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings (Loss) Per Share
The computation of basic and diluted earnings (loss) per share was as follows:
 
Three Months Ended March 31,
(in millions, except shares and per share amounts)
2016
 
2015
Net income (loss)
$
479

 
$
(63
)
Less: Dividends on preferred stock
(14
)
 
(14
)
Net income (loss) attributable to common stockholders - basic
465

 
(77
)
Add: Dividends related to mandatory convertible preferred stock
14

 
—

Net income (loss) attributable to common stockholders - diluted
$
479

 
$
(77
)
 
 
 
 
Weighted average shares outstanding - basic
819,431,761

 
808,605,526

Effect of dilutive securities:
 
 
 
Outstanding stock options and unvested stock awards
7,713,800

 
—

Mandatory convertible preferred stock
32,237,266

 
—

Weighted average shares outstanding - diluted
859,382,827

 
808,605,526

 
 
 
 
Earnings (loss) per share - basic
$
0.57

 
$
(0.09
)
Earnings (loss) per share - diluted
$
0.56

 
$
(0.09
)
 
 
 
 
Potentially dilutive securities:
 
 
 
Outstanding stock options and unvested stock awards
967,839

 
25,935,082

Mandatory convertible preferred stock
—

 
32,237,266