Income Taxes (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2011	May 31, 2010
Income Tax Uncertainties Abstract
Unrecognized Tax Benefits That Would Impact Effective Tax Rate	$ 56	$ 67
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest	18	20
Tax Positions For Which Ultimate Deductibility Or Income Inclusion Is Certain But Timing Uncertain Abstract
Tax Positions For Which Ultimate Deductibility Or Income Inclusion Is Certain But Timing Uncertain	9	9
Unremitted Earnings Of Foreign Subsidiaries Abstract
Unremitted Earnings Of Foreign Subsidiaries	640	325
Permanent Reinvestment Strategy Percent Benefit To Effective Tax Rate	1.30%
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy	300
Foreign Country Member
Operating Loss Carryforwards Line Items
Operating Loss Carryforwards	484
State And Local Jurisdiction Member
Operating Loss Carryforwards Line Items
Operating Loss Carryforwards	$ 524