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Income taxes - deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
Aug. 31, 2020
Aug. 31, 2019
Deferred tax assets:    
Compensation and benefits $ 177 $ 133
Postretirement benefits 105 0
Insurance 98 90
Accrued rent & lease obligations 5,187 219
Allowance for doubtful accounts 12 13
Tax attributes 6,909 6,687
Stock compensation 47 45
Deferred income 18 115
Other 80 78
Subtotal deferred tax assets 12,633 7,380
Less: valuation allowance 6,608 6,638
Total deferred tax assets 6,025 742
Deferred tax liabilities:    
Accelerated depreciation 722 475
Inventory 344 394
Intangible assets 1,274 1,116
Equity method investment 548 481
Lease right-of-use asset 4,589 0
Total deferred tax liabilities 7,477 2,466
Net deferred tax liabilities $ 1,452 $ 1,724