General (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
General Details [Abstract]
Dividends Payable, Date Declared	Aug. 16, 2013
Dividends Payable Amount Per Share	$ 0.15
Dividends Payable, Date To Be Paid	Oct. 01, 2013
Dividends Payable, Date Of Record	Sep. 10, 2013
Stock Based Compensation Details [Abstract]
Stock-based compensation	$ 45	$ 40
Treasury Shares [Abstract]
Number Of Shares Repurchased	2,800,000
Treasury Stock Acquired, Average Cost Per Share	$ 98
Payments for Repurchase of Common Stock	$ 278	$ 246
Stock Repurchase Authorization, Remaining Number of Shares	7,400,000