Stock-Based Compensation Plans (Details 1) - May. 31, 2015 - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Total
Stock Option activity [Roll Forward]
Options outstanding, Beginning balance, Shares	5.4
Options outstanding, Beginning balance, Weighted-average exercise price per share	$ 34.00
Options granted	0.8
Options granted, Weighted-average exercise price per share	$ 41.70
Options exercised	(1.5)
Options exercised, Weighted-average exercise price per share	$ 33.84
Options forfeited	0.0
Options forfeited, Weighted-average exercise price per share	$ 30.15
Options expired	0.0
Options expired, Weighted-average exercise price per share	$ 38.12
Options outstanding, Ending balance, Shares	4.7
Options outstanding, Ending balance, Weighted-average exercise price per share	$ 35.21
Options outstanding, Ending balance, Weighted-average remaining contractual term	6 years
Options outstanding, Ending balance, Aggregate intrinsic value	$ 66.3
Options exercisable, Ending balance, Shares	2.7
Options exercisable, Ending balance, Weighted-average exercise price per share	$ 33.42
Options exercisable, Ending balance, Weighted-average remaining contractual term	4 years 4 months 24 days
Options exercisable, Ending balance, Aggregate intrinsic value	$ 43.0