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Stockholders' Equity
 9 Months Ended
Sep. 30, 2015
Stockholders' Equity Note [Abstract]  
Stockholders' Equity
9. Stockholders’ Equity

The Company’s basic earnings per share (EPS) is computed based on the average number of shares of common stock outstanding for the period and includes the effect of any participating securities and TEUs as appropriate. Diluted EPS includes the effect of the Company’s outstanding stock options, restricted stock awards, restricted stock units, and TEUs, if the inclusion of these items is dilutive.
The following provides a reconciliation between basic and diluted earnings per share attributable to common stockholders:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
millions except per-share amounts
2015
 
2014
 
2015
 
2014
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
(2,235
)
 
$
1,087

 
$
(5,442
)
 
$
(1,355
)
Less noncontrolling interest effect of TEUs
3

 
—

 
3

 
—

Less distributions on participating securities
1

 
2

 
4

 
3

Less undistributed income allocated to participating securities
—

 
6

 
—

 
—

Basic
$
(2,239
)
 
$
1,079

 
$
(5,449
)
 
$
(1,358
)
Diluted
$
(2,239
)
 
$
1,079

 
$
(5,449
)
 
$
(1,358
)
Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
508

 
506

 
508

 
505

Dilutive effect of stock options
—

 
2

 
—

 
—

Average number of common shares outstanding—diluted
508

 
508

 
508

 
505

Excluded due to anti-dilutive effect
10

 
3

 
11

 
11

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
(4.41
)
 
$
2.13

 
$
(10.73
)
 
$
(2.69
)
Diluted
$
(4.41
)
 
$
2.12

 
$
(10.73
)
 
$
(2.69
)