Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical) (Unaudited)

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Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)
In Millions, except Per Share data, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Statement of Financial Position [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 600.0 600.0
Common stock, shares issued 363.7 365.4
Common stock, shares outstanding 363.7 365.4