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Retirement Plans (Details 6) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Pension Plans [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation ("ABO") $ 21,958 $ 21,556  
Changes in Projected Benefit Obligation ("PBO") and Accumulated Postretirement Benefit Obligation ("APBO")      
PBO/APBO at the beginning of year 22,187 17,372  
Service cost 692 593 521
Interest cost 968 976 900
Actuarial (gain) loss (652) 3,789  
Benefits paid (589) (502)  
Other (6) (41)  
PBO/APBO at the end of year 22,600 22,187 17,372
Change in Plan Assets      
Beginning balance May 31 17,334 15,841  
Actual return on plan assets 2,081 1,235  
Company contributions 615 780  
Benefits paid (589) (502)  
Other (8) (20)  
Ending balance May 31 19,433 17,334 15,841
Funded Status of the Plans (3,167) (4,853)  
Amount Recognized in the Balance Sheet at May 31      
Current pension, postretirement healthcare and other benefit obligations (48) (35)  
Noncurrent pension, postretirement healthcare and other benefit obligations (3,119) (4,818)  
Net amount recognized (3,167) (4,853)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost      
Net actuarial loss (gain) 6,993 8,866  
Prior service (credit) cost and other (781) (897)  
Total 6,212 7,969  
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract      
Net actuarial loss (gain) 378 516  
Prior service credit and other (114) (114)  
Total 264 402  
Postretirement Healthcare Plans [Member]
     
Changes in Projected Benefit Obligation ("PBO") and Accumulated Postretirement Benefit Obligation ("APBO")      
PBO/APBO at the beginning of year 790 648  
Service cost 42 35 31
Interest cost 36 36 34
Actuarial (gain) loss (17) 98  
Benefits paid (54) (51)  
Other 31 24  
PBO/APBO at the end of year 828 790 648
Change in Plan Assets      
Company contributions 27 27  
Benefits paid (54) (51)  
Other 27 24  
Funded Status of the Plans (828) (790)  
Amount Recognized in the Balance Sheet at May 31      
Current pension, postretirement healthcare and other benefit obligations (39) (33)  
Noncurrent pension, postretirement healthcare and other benefit obligations (789) (757)  
Net amount recognized (828) (790)  
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost      
Net actuarial loss (gain) (4) 13  
Prior service (credit) cost and other 2 2  
Total $ (2) $ 15