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Segment reporting (Details)
$ in Millions
3 Months Ended
Nov. 30, 2021
USD ($)
segment
Nov. 30, 2020
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | segment 3  
Segment Reporting Information [Line Items]    
Sales $ 33,901 $ 31,438
Adjusted operating income 1,777 1,196
Transformational cost management (203) (100)
Acquisition-related amortization (165) (95)
Acquisition-related costs (71) (21)
Adjustments to equity earnings (loss) in AmerisourceBergen (43) (1,481)
LIFO provision (14) (33)
Operating income (loss) 1,283 (535)
Reportable Segments | United States    
Segment Reporting Information [Line Items]    
Sales 28,032 27,163
Adjusted operating income 1,690 1,155
Reportable Segments | International    
Segment Reporting Information [Line Items]    
Sales 5,818 4,285
Adjusted operating income 164 87
Reportable Segments | Walgreens Health    
Segment Reporting Information [Line Items]    
Sales 51 0
Adjusted operating income (13) (3)
Corporate and Other    
Segment Reporting Information [Line Items]    
Sales 0 (10)
Adjusted operating income $ (63) $ (42)