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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Namespace Prefix:	us-gaap_
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Period Type:	duration

Sales (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Sales (Details) - USD ($) $ in Millions	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 32,597	$ 34,030	$ 100,254	$ 98,247
Reportable Segments \| United States
Disaggregation of Revenue [Line Items]
Sales	26,695	28,743	82,394	83,250
Reportable Segments \| United States \| Pharmacy
Disaggregation of Revenue [Line Items]
Sales	19,656	21,770	60,581	63,133
Reportable Segments \| United States \| Retail
Disaggregation of Revenue [Line Items]
Sales	7,039	6,973	21,814	20,117
Reportable Segments \| International
Disaggregation of Revenue [Line Items]
Sales	5,305	5,288	16,686	14,998
Reportable Segments \| International \| Pharmacy
Disaggregation of Revenue [Line Items]
Sales	901	958	2,876	2,791
Reportable Segments \| International \| Retail
Disaggregation of Revenue [Line Items]
Sales	1,618	1,455	5,294	4,618
Reportable Segments \| International \| Wholesale
Disaggregation of Revenue [Line Items]
Sales	2,786	2,875	8,516	7,588
Reportable Segments \| Walgreens Health
Disaggregation of Revenue [Line Items]
Sales	596	0	1,173	0
Corporate and Other
Disaggregation of Revenue [Line Items]
Sales	$ 1	$ 0	$ 0	$ 0