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Retirement Plans (Details 8) (USD $)
In Millions, unless otherwise specified
May 31, 2014
May 31, 2013
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]    
ABO $ (23,447) [1] $ (21,930) [1]
Fair value of plan assets 21,542 19,404
PBO (24,218) (22,570)
Net funded status (2,676) (3,166)
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets [Abstract]    
Fair value of plan assets 21,543 19,433
PBO (24,219) (22,600)
Net funded status $ (2,676) $ (3,167)
[1] ABO not used in determination of funded status.