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Goodwill and other intangible assets (Tables)
 9 Months Ended
May 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill by reportable segment consist of the following (in millions):

Goodwill rollforward:United StatesInternationalWalgreens Boots Alliance, Inc.
August 31, 2020$10,553 $1,460 $12,013 
Acquisitions394 21 416 
Currency translation adjustments— 65 65 
May 31, 2021$10,947 $1,547 $12,493 
Schedule of Finite-Lived Intangible Assets by Major Class
The carrying amount and accumulated amortization of intangible assets consist of the following (in millions):

Intangible assetsMay 31, 2021August 31, 2020
Gross amortizable intangible assets  
Customer relationships and loyalty card holders 1
$3,581 $3,502 
Trade names and trademarks373 348 
Purchasing and payer contracts337 337 
Others2
218 60 
Total gross amortizable intangible assets$4,510 $4,247 
Accumulated amortization  
Customer relationships and loyalty card holders 1
$1,306 $1,089 
Trade names and trademarks226 196 
Purchasing and payer contracts185 95 
Others2
32 26 
Total accumulated amortization1,749 1,406 
Total amortizable intangible assets, net$2,761 $2,841 
Indefinite-lived intangible assets  
Trade names and trademarks$5,526 $5,203 
Pharmacy licenses2,148 2,028 
Total indefinite-lived intangible assets$7,675 $7,231 
Total intangible assets, net$10,435 $10,072 
1Includes purchased prescription files.
2Includes acquired developed technology and non-compete agreements.
Schedule of Future Amortization Expense Estimated future annual amortization expense for the next five fiscal years for intangible assets recorded at May 31, 2021 is as follows (in millions):
 20222023202420252026
Estimated annual amortization expense$439 $336 $317 $289 $262