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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 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 
 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
)