Income Taxes (Details 7) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits That Would Impact Effective Tax Rate	$ 26	$ 30
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest	17	17
Permanently Reinvested Earnings Of Foreign Subsidiaries [Abstract]
Permanently Reinvested Earnings of Foreign Subsidiaries	1,900	1,600
Permanent Reinvestment Strategy Benefit To Effective Tax Rate	46
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy	478	$ 471
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	837
State And Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 157