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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2014
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
2014
 
2013
 
2014
 
2013
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
227

 
$
929

 
$
(2,442
)
 
$
1,389

Less distributions on participating securities
1

 
1

 
1

 
1

Less undistributed income allocated to participating securities
—

 
5

 
—

 
8

Basic
$
226

 
$
923

 
$
(2,443
)
 
$
1,380

Diluted
$
226

 
$
923

 
$
(2,443
)
 
$
1,380

Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
505

 
502

 
505

 
501

Dilutive effect of stock options
2

 
2

 
—

 
3

Average number of common shares outstanding—diluted
507

 
504

 
505

 
504

Excluded (1)
4

 
5

 
11

 
4

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
0.45

 
$
1.84

 
$
(4.84
)
 
$
2.75

Diluted
$
0.45

 
$
1.83

 
$
(4.84
)
 
$
2.74

 
 
 
 
 
 
 
 
Dividends per common share
$
0.27

 
$
0.09

 
$
0.45

 
$
0.18

 __________________________________________________________________
(1) 
Inclusion of certain shares would have had an anti-dilutive effect.