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Supplemental Cash Flow Information - Supplemental Cash Flow (Details) - USD ($)
$ in Millions
6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Supplemental Cash Flow Information [Abstract]    
Interest (net of capitalized interest) $ 377 $ 279
Income taxes 526 162
Income tax refunds received (22) (23)
Cash tax payments, net $ 504 $ 139