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Goodwill and other intangible assets (Tables)
 12 Months Ended
Aug. 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 activity (in millions):
Goodwill rollforward:United StatesInternationalWalgreens Boots Alliance, Inc.
August 31, 2019$10,491 $3,051 $13,542 
Acquisitions 1
62 — 62 
Impairment— (1,675)(1,675)
Currency translation adjustments— 83 83 
August 31, 2020$10,553 $1,460 $12,013 
Acquisitions 2
$394 $21 $414 
Currency translation adjustments— (7)(7)
August 31, 2021$10,947 $1,474 $12,421 
1    During the fiscal year ended August 31, 2020, the Company acquired the remaining two of three Rite Aid distribution centers including related inventory for cash consideration of $91 million resulting in an increase to goodwill of $62 million.
2    During the fiscal year ended August 31, 2021, the Company acquired a controlling equity interest in Innovation Associates, Inc. and a joint venture with McKesson which resulted in an increase to goodwill of $394 million and $21 million, respectively.
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 assets:August 31, 2021August 31, 2020
Gross amortizable intangible assets  
Customer relationships and loyalty card holders 1
$3,522 $3,502 
Tradenames and trademarks361 348 
Purchasing and payer contracts317 337 
Others 2
221 60 
Total gross amortizable intangible assets$4,421 $4,247 
Accumulated amortization 
Customer relationships and loyalty card holders 1
$1,335 $1,089 
Tradenames and trademarks226 196 
Purchasing and payer contracts227 95 
Others 2
37 26 
Total accumulated amortization1,826 1,406 
Total amortizable intangible assets, net$2,595 $2,841 
Indefinite-lived intangible assets  
Tradenames and trademarks$5,276 $5,203 
Pharmacy licenses2,066 2,028 
Total indefinite-lived intangible assets$7,342 $7,231 
Total intangible assets, net$9,936 $10,072 
1Includes purchased prescription files.
2Includes acquired developed technology and non-compete agreements.
Schedule of finite-lived intangible assets, future amortization expense Estimated future annual amortization expense for the next five fiscal years for intangible assets recorded at August 31, 2021 is as follows (in millions):
 20222023202420252026
Estimated annual amortization expense$444 $330 $311 $276 $258