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Retirement Plans (Details 10) - USD ($)
$ in Millions
May 31, 2016
May 31, 2015
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]    
ABO [1] $ (28,493) $ (26,413)
Fair value of plan assets 23,865 23,099
PBO (29,249) (27,132)
Net funded status $ (5,384) $ (4,033)
[1] ABO not used in determination of funded status.