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Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 24,168 $ 18,295 $ 17,757
Translation adjustments (363) 422 (254)
Ending Balance 24,939 24,168 18,295
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 (785) (1,207) (954)
Translation adjustments (363) 422 (254)
Ending Balance (1,148) (785) (1,207)
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 53 60 89
Prior service cost arising during period     3
Reclassifications from AOCI (8) (7) (82)
Ending Balance 45 53 60
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 (732) (1,147) (865)
Ending Balance $ (1,103) $ (732) (1,147)
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.