XML 63 R37.htm IDEA: XBRL DOCUMENT v3.6.0.2
Retirement Plans (Details 1) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Pension and Other Postretirement Benefit Expense [Abstract]        
Defined benefit pension plans $ 58 $ 54 $ 116 $ 107
Defined contribution plans 112 103 231 205
Postretirement healthcare plans 19 20 38 41
Retirement plans costs $ 189 $ 177 $ 385 $ 353