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Credit Losses - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
May 31, 2020
Credit Loss [Abstract]          
Credit losses $ 148 $ 102 $ 291 $ 208  
Allowance for credit losses $ 296   $ 296   $ 175