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Retirement Plans (Details 7) (USD $)
In Millions, unless otherwise specified
May 31, 2013
May 31, 2012
Qualified [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Projected Benefit Obligation ("PBO") $ 21,532 $ 21,192
Fair Value of Plan Assets 19,047 17,013
Funded Status of the Plans (2,485) (4,179)
Nonqualified [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Projected Benefit Obligation ("PBO") 322 355
Funded Status of the Plans (322) (355)
International Plans [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Projected Benefit Obligation ("PBO") 746 640
Fair Value of Plan Assets 386 321
Funded Status of the Plans (360) (319)
Components Total [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Projected Benefit Obligation ("PBO") 22,600 22,187
Fair Value of Plan Assets 19,433 17,334
Funded Status of the Plans $ (3,167) $ (4,853)