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Computation of Earnings Per Share (Details) (USD $)
In Millions, except Per Share data
3 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Basic earnings per common share:    
Net earnings allocable to common shares $ 463 [1] $ 379 [1]
Weighted-average common shares 316 314
Basic earnings per common share $ 1.46 $ 1.21
Diluted earnings per common share:    
Net earnings allocable to common shares $ 463 [1] $ 379 [1]
Weighted-average common shares 316 314
Dilutive effect of share-based awards 2 1
Weighted-average diluted shares 318 315
Diluted earnings per common share $ 1.46 $ 1.20
Anti-dilutive options excluded from diluted earnings per common share 13 11
[1] Net earnings available to participating securities were immaterial in all periods presented.