Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans (Details 5)

v2.4.0.8
Stock-Based Compensation Plans (Details 5) (Restricted Stock Unit [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Restricted Stock Unit [Member]
     
Non-vested/unearned shares activity      
Nonvested/unearned shares outstanding, Beginning balance 1.6    
Nonvested/unearned shares, Beginning balance, Weighted-average grant-date fair value per share $ 25.49    
Granted 0.7    
Granted, Weighted-average grant-date fair value per share $ 28.59 $ 27.67 $ 21.52
Vested (0.5)    
Vested, Weighted-average grant-date fair value per share $ 27.10    
Forfeited (0.2)    
Forfeited, Weighted-average grant-date fair value per share $ 25.96    
Nonvested/unearned shares, Ending Balance 1.6 1.6  
Nonvested/unearned shares, Ending balance, Weighted-average grant-date fair value per share $ 26.29 $ 25.49  
Weighted-average remaining vesting period (years) 1 year 7 months 6 days    
Aggregate intrinsic value, Ending balance $ 59.9