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Sales
 3 Months Ended
Nov. 30, 2018
Revenue from Contract with Customer [Abstract]  
Sales
Sales
The following table summarizes the Company’s sales by segment and by major source (in millions):
 
 
Three months ended November 30,
 
 
2018
 
2017
Retail Pharmacy USA
 
 
 
 
Pharmacy
 
$
19,147

 
$
16,282

Retail
 
6,574

 
6,207

Total
 
25,721

 
22,489

 
 
 
 
 
Retail Pharmacy International
 
 
 
 
Pharmacy
 
1,039

 
1,104

Retail
 
1,862

 
1,979

Total
 
2,901

 
3,083

 
 
 
 
 
Pharmaceutical Wholesale
 
5,708

 
5,718

 
 
 
 
 
Eliminations1
 
(537
)
 
(550
)
 
 
 
 
 
Walgreens Boots Alliance, Inc.
 
$
33,793

 
$
30,740


1 
Eliminations relate to intersegment sales between the Pharmaceutical Wholesale and the Retail Pharmacy International segments.

Contract balances with customers
Contract liabilities primarily represent the Company’s obligation to transfer additional goods or services to a customer for which the Company has received consideration, for example the Company’s Balance Rewards® and Boots Advantage Card loyalty programs. Under such programs, customers earn reward points on purchases for redemption at a later date. See note 18, supplemental information, for further information on receivables from contracts with customers.