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Retirement Plans (Details 1) - USD ($)
$ in Millions
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Pension and Other Postretirement Benefit Expense [Abstract]      
Defined benefit pension plans $ 214 $ (41) $ 99
Defined contribution plans 416 385 363
Postretirement healthcare plans 82 81 78
Retirement plans mark to market 1,498 2,190 15
Retirement plans costs $ 2,210 $ 2,615 $ 555