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Leases - Supplemental Income Statement Information (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Operating lease cost    
Fixed $ 805 $ 805
Variable 205 158
Finance lease cost    
Amortization 11 11
Interest 13 13
Sublease income 25 20
Impairment of right-of-use assets 68 10
Gain on sale and leaseback $ 87 $ 93