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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance $ 19,416 $ 16,073 $ 13,784
Translation adjustments (195) (74) (171)
Ending balance 17,757 19,416 16,073
Foreign Currency Translation Loss [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (759) (685) (514)
Translation adjustments (195) (74) (171)
Ending balance (954) (759) (685)
Retirement Plans Adjustments [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance 181 270 345
Prior service credit and other arising during period   (4) 1
Reclassifications from AOCI (92) (85) (76)
Ending balance 89 181 270
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (578) (415) (169)
Ending balance $ (865) $ (578) $ (415)