Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (Details 4)

v2.4.0.6
Stock-Based Compensation Plans (Details 4) (Performance Stock Options [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
May 31, 2012
Y
Performance Stock Options [Member]
 
Performance stock option activity  
Options outstanding, Beginning Balance, Shares   
Options outstanding, Beginning balance, Weighted-average exercise price per share   
Options Granted 2.7
Options granted, Weighted-average exercise price per share $ 30.83
Options exercised   
Options exercised, Weighted-average exercise price per share   
Options forfeited (0.1)
Options forfeited, Weighted-average exercise price per share $ 31.63
Options expired   
Options expired, Weighted-average exercise price per share   
Options outstanding, Ending balance, Shares 2.6
Options outstanding, Ending balance, Weighted-average remaining contractual term 9.2
Options outstanding, Ending balance, Aggregate intrinsic value $ 1.2
Options exercisable, Ending balance, Shares   
Options outstanding, Ending balance, Weighted-average exercise price per share $ 30.80
Options exercisable, Ending balance, Weighted-average exercise price per share   
Options exercisable, Ending balance, Weighted-average remaining contractual term   
Options exercisable, Ending balance, Aggregate intrinsic value