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Supplemental Cash Flow Information - Supplemental Cash Flow (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 357 $ 333
Income taxes 843 638
Income tax refunds received (82) (48)
Cash tax (refunds)/payments, net $ 761 $ 590