Sales (Details) - USD ($) $ in Millions	3 Months Ended
Nov. 30, 2022	Nov. 30, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 33,382	$ 33,901
Reportable Segments \| U.S. Retail Pharmacy
Disaggregation of Revenue [Line Items]
Sales	27,204	28,032
Reportable Segments \| U.S. Retail Pharmacy \| Pharmacy
Disaggregation of Revenue [Line Items]
Sales	20,218	21,105
Reportable Segments \| U.S. Retail Pharmacy \| Retail
Disaggregation of Revenue [Line Items]
Sales	6,986	6,927
Reportable Segments \| International
Disaggregation of Revenue [Line Items]
Sales	5,189	5,818
Reportable Segments \| International \| Pharmacy
Disaggregation of Revenue [Line Items]
Sales	867	1,017
Reportable Segments \| International \| Retail
Disaggregation of Revenue [Line Items]
Sales	1,650	1,796
Reportable Segments \| International \| Wholesale
Disaggregation of Revenue [Line Items]
Sales	2,672	3,005
Reportable Segments \| U.S. Healthcare
Disaggregation of Revenue [Line Items]
Sales	$ 989	$ 51

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details