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Stockholders' Equity
 3 Months Ended
Mar. 31, 2017
Stockholders' Equity Note [Abstract]  
Stockholders' Equity
13. Stockholders’ Equity

Earnings Per Share  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 Tangible Equity Units (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 EPS attributable to common stockholders:
 
Three Months Ended 
 March 31,
millions except per-share amounts
2017
 
2016
Net income (loss)
 
 
 
Net income (loss) attributable to common stockholders
$
(318
)
 
$
(1,034
)
Income (loss) effect of TEUs
(2
)
 
(1
)
Basic
$
(320
)
 
$
(1,035
)
Diluted
$
(320
)
 
$
(1,035
)
Shares
 
 
 
Average number of common shares outstanding—basic
551

 
509

Average number of common shares outstanding—diluted
551

 
509

Excluded due to anti-dilutive effect
11

 
10

Net income (loss) per common share
 
 
 
Basic
$
(0.58
)
 
$
(2.03
)
Diluted
$
(0.58
)
 
$
(2.03
)