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Supplemental Cash Flow Information - Supplemental Cash Flow (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 330 $ 377
Income taxes 474 526
Income tax refunds received (177) (22)
Cash tax payments, net $ 297 $ 504