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Goodwill and Other Intangible Assets (Summary of Goodwill) (Details) - USD ($)
$ in Millions
Aug. 31, 2021
Aug. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Gross Carrying Amount $ 1,735 $ 1,717
Accumulated Impairment $ 1,020 $ 1,020