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Goodwill and other intangible assets (Tables)
 12 Months Ended
Aug. 31, 2018
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):
 
 
Retail Pharmacy
USA
 
Retail Pharmacy
International
 
Pharmaceutical
Wholesale
 
Walgreens
Boots
Alliance, Inc.
August 31, 2016
 
$
9,036

 
$
3,369

 
$
3,122

 
$
15,527

Acquisitions
 
103

 
—

 
1

 
104

Currency translation adjustments
 
—

 
23

 
(22
)
 
1

August 31, 2017
 
$
9,139

 
$
3,392

 
$
3,101

 
$
15,632

Acquisitions
 
1,344

 
—

 
4

 
1,348

Currency translation adjustments
 
—

 
(22
)
 
(44
)
 
(66
)
August 31, 2018
 
$
10,483

 
$
3,370

 
$
3,061

 
$
16,914
Schedule of finite-lived intangible assets by major class
The carrying amount and accumulated amortization of intangible assets consists of the following (in millions):
 
August 31, 2018
 
August 31, 2017
Gross amortizable intangible assets
 
 
 
Customer relationships and loyalty card holders1
$
4,235

 
$
2,510

Favorable lease interests and non-compete agreements
680

 
523

Trade names and trademarks
489

 
504

Purchasing and payer contracts
390

 
391

Total gross amortizable intangible assets
5,794

 
3,928

 
 
 
 
Accumulated amortization
 

 


Customer relationships and loyalty card holders1
$
997

 
$
780

Favorable lease interests and non-compete agreements
359

 
355

Trade names and trademarks
206

 
155

Purchasing and payer contracts
78

 
51

Total accumulated amortization
1,640

 
1,341

Total amortizable intangible assets, net
$
4,154

 
$
2,587

 
 
 
 
Indefinite-lived intangible assets
 

 
 

Trade names and trademarks
$
5,557

 
$
5,514

Pharmacy licenses
2,072

 
2,055

Total indefinite lived intangible assets
$
7,629

 
$
7,569

 
 
 
 
Total intangible assets, net
$
11,783

 
$
10,156



1 
Includes purchased prescription files.
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, 2018 is as follows (in millions):
 
 
2019
 
2020
 
2021
 
2022
 
2023
Estimated annual amortization expense
 
$
531

 
$
461

 
$
410

 
$
390

 
$
354