EMPLOYEE BENEFIT PLANS Continued (Details) In Millions, unless otherwise specified	May 31, 2013	May 31, 2012	May 31, 2011	May 31, 2010	May 31, 2013 2000 Plan [Member]	Nov. 30, 2010 2000 Plan [Member]	May 31, 2013 Directors' Plan [Member]	May 31, 2013 Acquired plans [Member]
Stock-based Payment Award [Line Items]
Increase in number of authorized shares of stock that may be issued						388	2
Options outstanding	447	422	354	352	426		3	18
Options outstanding vested					180		2
Shares of common stock available for future awards					296		2
Options reserved for issuance under the Directors' Plan							10
Restricted stock-based awards outstanding								1