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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2013
Table Text Block [Abstract]  
Earnings Per Share Table
The reconciliation between basic and diluted earnings per share attributable to common stockholders is as follows:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
millions except per-share amounts
2013
 
2012
 
2013
 
2012
Net income (loss)
 
 
 
 
 
 
 
Net income (loss) attributable to common stockholders
$
929

 
$
(89
)
 
$
1,389

 
$
2,067

Less distributions on participating securities
1

 
—

 
1

 
1

Less undistributed income allocated to participating securities
5

 
—

 
8

 
12

Basic
$
923

 
$
(89
)
 
$
1,380

 
$
2,054

Diluted
$
923

 
$
(89
)
 
$
1,380

 
$
2,054

Shares
 
 
 
 
 
 
 
Average number of common shares outstanding—basic
502

 
500

 
501

 
499

Dilutive effect of stock options
2

 
—

 
3

 
2

Average number of common shares outstanding—diluted
504

 
500

 
504

 
501

Excluded (1)
5

 
12

 
4

 
5

Net income (loss) per common share
 
 
 
 
 
 
 
Basic
$
1.84

 
$
(0.18
)
 
$
2.75

 
$
4.11

Diluted
$
1.83

 
$
(0.18
)
 
$
2.74

 
$
4.10

 
 
 
 
 
 
 
 
Dividends per common share
$
0.09

 
$
0.09

 
$
0.18

 
$
0.18

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