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Income taxes - deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
Aug. 31, 2021
Aug. 31, 2020
Deferred tax assets:    
Compensation and benefits $ 175 $ 176
Postretirement benefits 0 88
Insurance 103 98
Accrued rent & lease obligations 5,372 5,187
Allowance for doubtful accounts 34 9
Tax attributes 7,467 6,781
Stock compensation 88 47
Deferred income 34 18
Other 0 50
Subtotal deferred tax assets 13,273 12,454
Less: valuation allowance 7,239 6,490
Total deferred tax assets 6,034 5,964
Deferred tax liabilities:    
Accelerated depreciation 896 683
Inventory 377 345
Intangible assets 1,465 1,130
Equity method investment 236 542
Lease right-of-use asset 4,792 4,589
Other 30 0
Total deferred tax liabilities 7,796 7,289
Net deferred tax liabilities $ 1,762 $ 1,325