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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 17,757 $ 19,416 $ 16,073
Translation adjustments (254) (195) (74)
Ending Balance 18,295 17,757 19,416
ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification to retained earnings due to the adoption of ASU 2018-02 [1] 51    
Foreign Currency Translation Loss [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (954) (759) (685)
Translation adjustments (254) (195) (74)
Ending Balance (1,207) (954) (759)
Foreign Currency Translation Loss [Member] | ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification to retained earnings due to the adoption of ASU 2018-02 1    
Retirement Plans Adjustments [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 89 181 270
Prior service cost (credit) arising during period 3   (4)
Reclassifications from AOCI (82) (92) (85)
Ending Balance 60 89 181
Retirement Plans Adjustments [Member] | ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification to retained earnings due to the adoption of ASU 2018-02 50    
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (865) (578) (415)
Ending Balance (1,147) $ (865) $ (578)
Accumulated Other Comprehensive Loss [Member] | ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification to retained earnings due to the adoption of ASU 2018-02 [1] $ 51    
[1] Relates to the adoption of ASU 2018-02.