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Stockholders' Equity
 6 Months Ended
Jun. 30, 2016
Stockholders' Equity Note [Abstract]  
Stockholders' Equity
14. 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, TEUs, and WES Series A Preferred units, 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 
 June 30,
 
Six Months Ended 
 June 30,
millions except per-share amounts
2016
 
2015
 
2016
 
2015
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
(692
)
 
$
61

 
$
(1,726
)
 
$
(3,207
)
Income (loss) effect of TEUs
(2
)
 
—

 
(3
)
 
—

Less distributions on participating securities
—

 
1

 
—

 
2

Basic
$
(694
)
 
$
60

 
$
(1,729
)
 
$
(3,209
)
Income (loss) effect of TEUs
(1
)
 
—

 
(1
)
 
—

Diluted
$
(695
)
 
$
60

 
$
(1,730
)
 
$
(3,209
)
Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
510

 
508

 
510

 
507

Dilutive effect of stock options
—

 
1

 
—

 
—

Average number of common shares outstanding—diluted
510

 
509

 
510

 
507

Excluded due to anti-dilutive effect
11

 
6

 
10

 
11

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
(1.36
)
 
$
0.12

 
$
(3.39
)
 
$
(6.32
)
Diluted
$
(1.36
)
 
$
0.12

 
$
(3.39
)
 
$
(6.32
)