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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2015
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
2015
 
2014
 
2015
 
2014
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
61

 
$
227

 
$
(3,207
)
 
$
(2,442
)
Less distributions on participating securities
1

 
1

 
2

 
1

Basic
$
60

 
$
226

 
$
(3,209
)
 
$
(2,443
)
Diluted
$
60

 
$
226

 
$
(3,209
)
 
$
(2,443
)
Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
508

 
505

 
507

 
505

Dilutive effect of stock options
1

 
2

 
—

 
—

Average number of common shares outstanding—diluted
509

 
507

 
507

 
505

Excluded due to anti-dilutive effect
6

 
4

 
11

 
11

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
0.12

 
$
0.45

 
$
(6.32
)
 
$
(4.84
)
Diluted
$
0.12

 
$
0.45

 
$
(6.32
)
 
$
(4.84
)