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Financing Arrangements (Details 1) - USD ($)
$ in Millions
Aug. 31, 2016
May 31, 2016
Financing Arrangements (Details) [Line Items]    
Long Term Debt Exclusive of Capital Leases Carrying Value $ 13,700 $ 13,700
Long Term Debt Exclusive Of Capital Leases Fair Value $ 15,000 $ 14,300
Long-term debt weighted average interest rate 3.60%