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Exit and disposal activities - Restructuring Costs (Details) - Transformational Cost Management Program - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2024
Feb. 28, 2023
Feb. 29, 2024
Feb. 28, 2023
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges $ 195 $ 138 $ 272 $ 267
Reportable segments | U.S. Retail Pharmacy        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 175 131 240 250
Reportable segments | International        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 16 4 22 10
Reportable segments | U.S. Healthcare        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 3 0 5 0
Corporate and Other        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 1 2 5 6
Lease obligations and other real estate costs        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 120 20 156 98
Lease obligations and other real estate costs | Reportable segments | U.S. Retail Pharmacy        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 119 20 155 98
Lease obligations and other real estate costs | Reportable segments | International        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 1 0 1 0
Lease obligations and other real estate costs | Reportable segments | U.S. Healthcare        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 0 0 0
Lease obligations and other real estate costs | Corporate and Other        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 0 0 0
Asset impairments        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 39 95 49 113
Asset impairments | Reportable segments | U.S. Retail Pharmacy        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 25 96 28 115
Asset impairments | Reportable segments | International        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 14 (1) 21 (1)
Asset impairments | Reportable segments | U.S. Healthcare        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 0 0 0
Asset impairments | Corporate and Other        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 0 0 0
Employee severance and business transition costs        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 33 15 60 31
Employee severance and business transition costs | Reportable segments | U.S. Retail Pharmacy        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 29 11 51 22
Employee severance and business transition costs | Reportable segments | International        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 1 0 2
Employee severance and business transition costs | Reportable segments | U.S. Healthcare        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 3 0 5 0
Employee severance and business transition costs | Corporate and Other        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 1 3 5 7
Information technology transformation and other exit costs        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 3 9 7 25
Information technology transformation and other exit costs | Reportable segments | U.S. Retail Pharmacy        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 3 4 6 16
Information technology transformation and other exit costs | Reportable segments | International        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 5 1 10
Information technology transformation and other exit costs | Reportable segments | U.S. Healthcare        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges 0 0 0 0
Information technology transformation and other exit costs | Corporate and Other        
Restructuring Cost and Reserve [Line Items]        
Total pre-tax exit and disposal charges $ 0 $ (1) $ 0 $ (1)