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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]          
Foreign currency translation gain (loss): Beginning balance $ (424) $ (72) $ (253) $ 81  
Translation adjustment (99) (152) (270) (305)  
Foreign currency translation gain (loss): Ending balance (523) (224) (523) (224)  
Retirement plans adjustments: Beginning Balance 383 391 425 425  
Reclassification from AOCI (19) (18) (61) (52)  
Retirement plans adjustments: Ending Balance 364 373 364 373  
Accumulated other comprehensive (loss) income at end of period (159) 149 (159) 149 $ 172
Amortization of retirement plans prior service credits, before tax (31) (28) (91) (83)  
Income tax benefit 12 10 30 31  
AOCI reclassifications, net of tax $ (19) $ (18) $ (61) $ (52)