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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
May 31, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]          
Foreign currency translation loss: Beginning balance $ (732) $ (424) $ (514) $ (253)  
Translation adjustments 110 (99) (108) (270)  
Foreign currency translation loss: Ending balance (622) (523) (622) (523)  
Retirement plans adjustments: Beginning Balance 307 383 345 425  
Reclassifications from AOCI (19) (19) (57) (61)  
Retirement plans adjustments: Ending Balance 288 364 288 364  
Accumulated other comprehensive loss at end of period $ (334) $ (159) $ (334) $ (159) $ (169)