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Stock Based Compensation Plans (Tables) | 12 Months Ended
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May 31, 2011
Stock Based Compensation Plans (Tables) [Abstract] |
Broad-based stock option grants |
|  |  |  |  |  | Shares |  |
|  | Shares |  | Exercise |  | outstanding as of |  |
|  | granted |  | price |  | May 31, 2011 |  |
Date of broad-based grant |  | (millions) |  | per share |  | (millions) |  | Vesting schedule
April 2004 |  |  | 1.7 |  |  | $ | 37.72 |  |  |  | 0.7 |  |  | 25% each April in 2005 through 2008
October 2006 |  |  | 2.0 |  |  | $ | 37.32 |  |  |  | 1.2 |  |  | 20% each October in 2007 through 2011
Stock option activity |
|  |  |  |  |  |  |  | Weighted-average |  |  |  |
|  | Shares subject |  |  | Weighted-average |  |  | remaining |  |  | Aggregate intrinsic |
|  | to options |  |  | exercise price |  |  | contractual term |  |  | value(1) |
|  | (millions) |  |  | per share |  |  | (years) |  |  | (millions) |
Outstanding as of May 31, 2008 |  |  | 14.3 |  |  | $ | 35.00 |  |  |  |  |  |  |  |  |
Granted |  |  | 1.0 |  |  | $ | 30.10 |  |  |  |  |  |  |  |  |
Exercised |  |  | (0.4 | ) |  | $ | 23.41 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (0.6 | ) |  | $ | 36.11 |  |  |  |  |  |  |  |  |
Expired |  |  | (0.3 | ) |  | $ | 37.56 |  |  |  |  |  |  |  |  |
Outstanding as of May 31, 2009 |  |  | 14.0 |  |  | $ | 34.84 |  |  |  |  |  |  |  |  |
Granted |  |  | 1.4 |  |  | $ | 26.34 |  |  |  |  |  |  |  |  |
Exercised |  |  | (0.4 | ) |  | $ | 23.12 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (0.4 | ) |  | $ | 33.35 |  |  |  |  |  |  |  |  |
Expired |  |  | (0.4 | ) |  | $ | 36.18 |  |  |  |  |  |  |  |  |
Outstanding as of May 31, 2010 |  |  | 14.2 |  |  | $ | 34.31 |  |  |  |  |  |  |  |  |
Granted |  |  | 0.5 |  |  | $ | 26.83 |  |  |  |  |  |  |  |  |
Exercised |  |  | (0.4 | ) |  | $ | 28.58 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (0.8 | ) |  | $ | 29.68 |  |  |  |  |  |  |  |  |
Expired |  |  | (1.0 | ) |  | $ | 39.41 |  |  |  |  |  |  |  |  |
Outstanding as of May 31, 2011 |  |  | 12.5 |  |  | $ | 34.14 |  |  |  | 4.6 |  |  | $ | 12.2 |
Exercisable as of May 31, 2011 |  |  | 10.4 |  |  | $ | 34.76 |  |  |  | 4.0 |  |  | $ | 5.4 |
(1) |  | Market price of the underlying stock as of May 31, 2011 less the exercise price.
Stock-based compensation, stock option plan other information |
|  | Year ended May 31, |
In millions, except per share amounts |  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted-average grant-date fair value of stock options granted (per share) |  | $ | 4.02 |  |  | $ | 4.37 |  |  | $ | 6.52 |
Total intrinsic value of stock options exercised |  | $ | 1.9 |  |  | $ | 1.4 |  |  | $ | 2.6 |
Total grant-date fair value of stock options vested |  | $ | 20.0 |  |  | $ | 19.0 |  |  | $ | 25.8 |
Weighted average assumptions used for valuation |
|  | Year ended May 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Risk-free interest rate |  |  | 2.2 | % |  |  | 3.0 | % |  |  | 3.2 | %
Dividend yield |  |  | 4.2 | % |  |  | 4.5 | % |  |  | 3.6 | %
Volatility factor |  |  | .24 |  |  |  | .28 |  |  |  | .28 |
Expected option life in years |  |  | 6.5 |  |  |  | 6.3 |  |  |  | 6.3 |
Restricted stock activity |
|  |  |  |  | Weighted-average |
|  |  |  |  | grant-date |
|  | Restricted |  |  | fair value |
In millions, except per share amounts |  | shares |  |  | per share |
Nonvested as of May 31, 2008 |  |  | 0.2 |  |  | $ | 41.48 |
Granted |  |  | 0.1 |  |  | $ | 31.76 |
Vested |  |  | (0.1 | ) |  | $ | 39.82 |
Forfeited |  |  | — |  |  | $ | 36.81 |
Nonvested as of May 31, 2009 |  |  | 0.2 |  |  | $ | 36.74 |
Granted |  |  | 0.2 |  |  | $ | 24.60 |
Vested |  |  | — |  |  | $ | 35.79 |
Forfeited |  |  | — |  |  | $ | 32.66 |
Nonvested as of May 31, 2010 |  |  | 0.4 |  |  | $ | 31.95 |
Granted |  |  | 0.1 |  |  | $ | 26.40 |
Vested |  |  | (0.1 | ) |  | $ | 35.60 |
Forfeited |  |  | (0.1 | ) |  | $ | 30.02 |
Nonvested as of May 31, 2011 |  |  | 0.3 |  |  | $ | 29.88 |
Restricted stock unit activity |
|  |  |  |  | Weighted-average |
|  |  |  |  | grant-date |
|  |  |  |  | fair value |
In millions, except per share amounts |  | RSUs |  |  | per share |
Nonvested as of May 31, 2008 |  |  | 0.4 |  |  | $ | 40.60 |
Granted |  |  | 0.6 |  |  | $ | 28.30 |
Vested |  |  | (0.1 | ) |  | $ | 40.60 |
Forfeited |  |  | — |  |  | $ | 34.65 |
Nonvested as of May 31, 2009 |  |  | 0.9 |  |  | $ | 32.93 |
Granted |  |  | 0.6 |  |  | $ | 20.62 |
Vested |  |  | (0.2 | ) |  | $ | 34.01 |
Forfeited |  |  | (0.1 | ) |  | $ | 28.88 |
Nonvested as of May 31, 2010 |  |  | 1.2 |  |  | $ | 27.39 |
Granted |  |  | 0.6 |  |  | $ | 21.52 |
Vested |  |  | (0.3 | ) |  | $ | 28.96 |
Forfeited |  |  | (0.1 | ) |  | $ | 25.08 |
Nonvested as of May 31, 2011 |  |  | 1.4 |  |  | $ | 24.83 |
Performance shares activity |
|  |  |  |  | Weighted-average |
|  |  |  |  | grant-date |
|  | Performance |  |  | fair value |
In millions, except per share amounts |  | shares |  |  | per share |
Unearned performance shares as of May 31, 2010 |  |  | — |  |  | $ | — |
Granted(1) |  |  | 0.1 |  |  | $ | 23.85 |
Forfeited |  |  | — |  |  | $ | 23.55 |
Unearned performance shares as of May 31, 2011 |  |  | 0.1 |  |  | $ | 23.90 |
(1) |  | Performance shares granted assuming achievement of performance goals at target. Actual amount of shares to be earned may differ from this amount.

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- Definition Disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + Details
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