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Income taxes - deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
Aug. 31, 2022
Aug. 31, 2021
Deferred tax assets:    
Compensation and benefits $ 171 $ 175
Insurance 108 103
Accrued rent & lease obligations 5,296 5,372
Allowance for doubtful accounts 53 34
Tax attributes 7,825 7,467
Stock compensation 56 88
Deferred income 120 34
Other 230 189
Subtotal deferred tax assets 13,859 13,462
Less: valuation allowance 7,521 7,239
Total deferred tax assets 6,338 6,223
Deferred tax liabilities:    
Accelerated depreciation 634 896
Inventory 441 377
Intangible assets 1,134 1,465
Equity method investment 314 236
Lease right-of-use asset 4,763 4,792
Other 355 219
Total deferred tax liabilities 7,641 7,985
Net deferred tax liabilities $ 1,303 $ 1,762