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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 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 
 September 30,
 
Nine Months Ended 
 September 30,
millions except per-share amounts
2014
 
2013
 
2014
 
2013
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
1,087

 
$
182

 
$
(1,355
)
 
$
1,571

Less distributions on participating securities
2

 
—

 
3

 
1

Less undistributed income allocated to participating securities
6

 
1

 
—

 
9

Basic
$
1,079

 
$
181

 
$
(1,358
)
 
$
1,561

Diluted
$
1,079

 
$
181

 
$
(1,358
)
 
$
1,561

Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
506

 
503

 
505

 
502

Dilutive effect of stock options
2

 
2

 
—

 
2

Average number of common shares outstanding—diluted
508

 
505

 
505

 
504

Excluded (1)
3

 
3

 
11

 
4

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
2.13

 
$
0.36

 
$
(2.69
)
 
$
3.11

Diluted
$
2.12

 
$
0.36

 
$
(2.69
)
 
$
3.10

 
 
 
 
 
 
 
 
Dividends per common share
$
0.27

 
$
0.18

 
$
0.72

 
$
0.36

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