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Goodwill and other intangible assets (Tables)
 3 Months Ended
Nov. 30, 2019
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  
Acquisitions8  —  —  8  
Currency translation adjustments—  110  122  232  
November 30, 2019$10,500  $3,289  $3,012  $16,800  
Schedule of Finite-Lived Intangible Assets by Major Class The carrying amount and accumulated amortization of intangible assets consist of the following (in millions):
 November 30, 2019August 31, 2019
Gross amortizable intangible assets  
Customer relationships and loyalty card holders1
$4,391  $4,290  
Favorable lease interests and non-compete agreements2
57  654  
Trade names and trademarks473  461  
Purchasing and payer contracts373  382  
Total gross amortizable intangible assets5,294  5,787  
Accumulated amortization  
Customer relationships and loyalty card holders1
$1,364  $1,262  
Favorable lease interests and non-compete agreements2
27  410  
Trade names and trademarks264  250  
Purchasing and payer contracts97  99  
Total accumulated amortization1,753  2,021  
Total amortizable intangible assets, net$3,541  $3,766  
Indefinite-lived intangible assets  
Trade names and trademarks$5,529  $5,232  
Pharmacy licenses1,985  1,878  
Total indefinite-lived intangible assets$7,514  $7,110  
Total intangible assets, net$11,055  $10,876  
Schedule of Future Amortization Expense
Estimated future annual amortization expense for the next five fiscal years for intangible assets recorded at November 30, 2019 is as follows (in millions):
 20212022202320242025
Estimated annual amortization expense$423  $404  $371  $352  $328