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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 17,757  
Translation adjustments $ (1) $ 103 (12) $ (90)
Ending Balance 18,831 19,894 18,831 19,894
Foreign Currency Translation Loss [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (964) (952) (954) (759)
Translation adjustments (1) 103 (12) (90)
Ending Balance (965) (849) (965) (849)
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 98 135 89 181
Reclassifications from AOCI (20) (23) (61) (69)
Ending Balance 78 112 78 112
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 (866) (817) (865) (578)
Ending Balance $ (887) $ (737) (887) $ (737)
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.