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Goodwill and other intangible assets (Tables)
 6 Months Ended
Feb. 29, 2020
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):
 Retail Pharmacy USARetail Pharmacy InternationalPharmaceutical WholesaleWalgreens Boots Alliance, Inc.
August 31, 2019$10,491  $3,179  $2,890  $16,560  
Acquisitions47  —  —  47  
Currency translation adjustments—  84  97  181  
February 29, 2020$10,538  $3,263  $2,987  $16,788  
Schedule of Finite-Lived Intangible Assets by Major Class The carrying amount and accumulated amortization of intangible assets consist of the following (in millions):
 February 29, 2020August 31, 2019
Gross amortizable intangible assets  
Customer relationships and loyalty card holders$4,397  $4,290  
Favorable lease interests and non-compete agreements1
58  654  
Trade names and trademarks455  461  
Purchasing and payer contracts373  382  
Total gross amortizable intangible assets5,283  5,787  
Accumulated amortization  
Customer relationships and loyalty card holders$1,437  $1,262  
Favorable lease interests and non-compete agreements1
26  410  
Trade names and trademarks255  250  
Purchasing and payer contracts103  99  
Total accumulated amortization1,821  2,021  
Total amortizable intangible assets, net$3,462  $3,766  
Indefinite-lived intangible assets  
Trade names and trademarks$5,494  $5,232  
Pharmacy licenses1,972  1,878  
Total indefinite-lived intangible assets$7,466  $7,110  
Total intangible assets, net$10,929  $10,876  
Schedule of Future Amortization Expense
Estimated future annual amortization expense for the next five fiscal years for intangible assets recorded at February 29, 2020 is as follows (in millions):
 20212022202320242025
Estimated annual amortization expense$432  $413  $379  $360  $330