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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2016
Stockholders' Equity Note [Abstract]  
Earnings Per Share Table
The following provides a reconciliation between basic and diluted earnings per share attributable to common stockholders:
 
Three Months Ended 
 March 31,
millions except per-share amounts
2016
 
2015
Net income (loss)
 
 
 
Net income (loss) attributable to common stockholders
$
(1,034
)
 
$
(3,268
)
Income (loss) effect of TEUs
(1
)
 
—

Less distributions on participating securities
—

 
1

Basic
$
(1,035
)
 
$
(3,269
)
Diluted
$
(1,035
)
 
$
(3,269
)
Shares
 
 
 
Average number of common shares outstanding—basic
509

 
507

Average number of common shares outstanding—diluted
509

 
507

Excluded due to anti-dilutive effect
10

 
11

Net income (loss) per common share
 
 
 
Basic
$
(2.03
)
 
$
(6.45
)
Diluted
$
(2.03
)
 
$
(6.45
)