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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Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Sales (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Sales (Details) - USD ($) $ in Millions	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 33,756	$ 32,779	$ 67,656	$ 64,217
Reportable Segments \| United States
Disaggregation of Revenue [Line Items]
Sales	27,667	27,344	55,699	54,507
Reportable Segments \| United States \| Pharmacy
Disaggregation of Revenue [Line Items]
Sales	19,820	20,494	40,925	41,363
Reportable Segments \| United States \| Retail
Disaggregation of Revenue [Line Items]
Sales	7,847	6,850	14,774	13,144
Reportable Segments \| International
Disaggregation of Revenue [Line Items]
Sales	5,563	5,425	11,381	9,709
Reportable Segments \| International \| Pharmacy
Disaggregation of Revenue [Line Items]
Sales	958	938	1,975	1,833
Reportable Segments \| International \| Retail
Disaggregation of Revenue [Line Items]
Sales	1,880	1,632	3,676	3,154
Reportable Segments \| International \| Wholesale
Disaggregation of Revenue [Line Items]
Sales	2,725	2,855	5,730	4,722
Reportable Segments \| Walgreens Health
Disaggregation of Revenue [Line Items]
Sales	527	0	577	0
Corporate and Other
Disaggregation of Revenue [Line Items]
Sales	$ (1)	$ 10	$ (1)	$ 0