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Share-Based Compensation
3 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
5. Share-Based Compensation

Pursuant to applicable accounting guidance for share-based payments, companies must recognize the cost of employee services received in exchange for awards of equity instruments based on the grant-date fair value of those awards.

Total share-based compensation for the three months ended September 30, 2012 and 2011 are summarized in the following table (amounts in millions):
 
Three Months Ended September 30
 
 
2012
 
2011
 
Share-Based Compensation
 
 
 
 
Stock options
$
54

  
$
62

 
Other share-based awards
25

  
18

 
Total share-based compensation
$
79

  
$
80

 
Assumptions utilized in the model are evaluated and revised, as necessary, to reflect market conditions and experience.