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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 24,168  
Translation adjustments $ (94) $ 124 (241) $ 253
Ending Balance 24,940 21,039 24,940 21,039
Foreign Currency Translation Loss [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (932) (1,078) (785) (1,207)
Translation adjustments (94) 124 (241) 253
Ending Balance (1,026) (954) (1,026) (954)
Retirement Plans Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 51 58 53 60
Reclassifications from AOCI (2) (2) (4) (4)
Ending Balance 49 56 49 56
Accumulated Other Comprehensive (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (881) (1,020) (732) (1,147)
Ending Balance $ (977) $ (898) $ (977) $ (898)