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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 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 
 September 30,
 
Nine Months Ended 
 September 30,
millions except per-share amounts
2016
 
2015
 
2016
 
2015
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
(830
)
 
$
(2,235
)
 
$
(2,556
)
 
$
(5,442
)
Income (loss) effect of TEUs
(2
)
 
(3
)
 
(5
)
 
(3
)
Less distributions on participating securities
1

 
1

 
1

 
4

Basic
$
(833
)
 
$
(2,239
)
 
$
(2,562
)
 
$
(5,449
)
Income (loss) effect of TEUs
—

 
—

 
(1
)
 
—

Diluted
$
(833
)
 
$
(2,239
)
 
$
(2,563
)
 
$
(5,449
)
Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
517

 
508

 
512

 
508

Average number of common shares outstanding—diluted
517

 
508

 
512

 
508

Excluded due to anti-dilutive effect
11

 
10

 
11

 
11

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
(1.61
)
 
$
(4.41
)
 
$
(5.00
)
 
$
(10.73
)
Diluted
$
(1.61
)
 
$
(4.41
)
 
$
(5.00
)
 
$
(10.73
)