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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, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance     $ 16,073  
Translation adjustments $ 100 $ 110 119 $ (108)
Ending balance 18,894   18,894  
Foreign Currency Translation Loss [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance (666) (732) (685) (514)
Translation adjustments 100 110 119 (108)
Ending balance (566) (622) (566) (622)
Retirement Plans Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning balance 232 307 270 345
Reclassifications from AOCI (23) (19) (61) (57)
Ending balance 209 288 209 288
Accumulated Other Comprehensive (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Ending balance $ (357) $ (334) $ (357) $ (334)