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Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Nov. 30, 2014
May 31, 2014
Financing Arrangements (Details) [Line Items]    
Line Of Credit Facility Maximum Borrowing Capacity $ 1,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Long Term Debt Exclusive of Capital Leases Carrying Value 4,700us-gaap_LongTermDebt 4,700us-gaap_LongTermDebt
Long Term Debt Exclusive Of Capital Leases Fair Value $ 5,100us-gaap_LongTermDebtFairValue $ 5,000us-gaap_LongTermDebtFairValue
Line Of Credit Facility Covenant Terms Maximum Leverage Ratio 70%  
Line Of Credit Facility Covenant Terms Leverage Ratio 57%