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Supplemental Cash Flow Information - Supplemental Cash Flow (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Supplemental Cash Flow Information [Abstract]      
Interest (net of capitalized interest) $ 695 $ 819 $ 639
Income taxes 751 1,374 389
Income tax refunds received (574) (55) (353)
Cash tax payments, net $ 177 $ 1,319 $ 36