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Equity-Based Compensation Information Related to Stock Options (Tables)
 12 Months Ended
Dec. 31, 2011
Information Related to Stock Options [Abstract]  
Information related to stock options
Information related to stock options follows:
 
2011
 
2010
 
2009
Pretax expense for stock options
$
5

 
$
11

 
$
28

After-tax expense for stock options
4

 
8

 
19

Proceeds from stock options exercised
71

 
157

 
27

Income tax benefit related to stock options exercised

 

 

Tax benefit classified in operating activities in the Consolidated
   Statements of Cash Flows
13

 
—

 
2

Excess tax benefit classified in financing activities in the
   Consolidated Statements of Cash Flows
33

 
—

 
4

Intrinsic value of stock options exercised
62

 
98

 
19

Total fair value of stock options vesting
$
5

 
$
11

 
$
22

 

 

 

Stock options exercised, in millions of options
2.541

 
6.096

 
1.688