Income Taxes (Details 10) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015
Permanently Reinvested Earnings Of Foreign Subsidiaries [Abstract]
Permanently Reinvested Earnings of Foreign Subsidiaries	$ 1,600	$ 1,900
Permanent Reinvestment Strategy Benefit To Effective Tax Rate	$ 48
Percent Income Earned in US Companies	80.00%
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy	$ 522	$ 478