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Financing Arrangements (Details 2)
$ in Millions
9 Months Ended
Feb. 29, 2016
USD ($)
Line Of Credit Facility [Line Items]  
Line Of Credit Facility Maximum Borrowing Capacity $ 1,750
Line of Credit Facility, Expiration Date Nov. 13, 2020
Financial Covenant Terms Ratio 350.00%
Financial Covenant Compliance Ratio 120.00%
Letters Of Credit Outstanding $ 318
Letter of Credit [Member]  
Line Of Credit Facility [Line Items]  
Line Of Credit Facility Maximum Borrowing Capacity 500
LineOfCreditFacilityRemainingBorrowingCapacity $ 182