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Financing Arrangements (Details 1) - USD ($)
$ in Millions
9 Months Ended
Feb. 29, 2016
May. 31, 2015
Financing Arrangements (Details) [Line Items]    
Long Term Debt Exclusive of Capital Leases Carrying Value $ 8,500 $ 7,200
Long Term Debt Exclusive Of Capital Leases Fair Value 8,500 $ 7,400
Senior Unsecured Debt Due In 2045 [Member]    
Financing Arrangements (Details) [Line Items]    
Senior Unsecured Debt Issued $ 1,250  
Debt Instrument, Interest Rate, Stated Percentage 4.75%  
Debt Instrument, Maturity Date Nov. 15, 2045