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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
May 31, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]          
Foreign currency translation gain (loss): Beginning balance $ (502) $ (391) $ (514) $ (253)  
Translation adjustment (230) (33) (218) (171)  
Foreign currency translation gain (loss): Ending balance (732) (424) (732) (424)  
Retirement plans adjustments: Beginning Balance 326 401 345 425  
Reclassification from AOCI 19 18 38 42  
Retirement plans adjustments: Ending Balance 307 383 307 383  
Accumulated other comprehensive (loss) income at end of period (425) (41) (425) (41) $ (169)
Amortization of retirement plans prior service credits, before tax 30 29 60 60  
Income tax benefit (11) (11) (22) (18)  
AOCI reclassifications, net of tax $ 19 $ 18 $ 38 $ 42