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Sales
 6 Months Ended
Feb. 28, 2019
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 February 28,
 
Six months ended February 28,
 
2019
 
2018
 
2019
 
2018
Retail Pharmacy USA
 
 
 
 
 
 
 
Pharmacy
$
18,892

 
$
17,208

 
$
38,039

 
$
33,487

Retail
7,366

 
7,270

 
13,940

 
13,480

Total
26,257

 
24,478

 
51,979

 
46,967

 
 
 
 
 
 
 
 
Retail Pharmacy International
 
 
 
 
 
 
 
Pharmacy
1,010

 
1,095

 
2,049

 
2,202

Retail
2,072

 
2,222

 
3,933

 
4,198

Total
3,082

 
3,317

 
5,982

 
6,400

 
 
 
 
 
 
 
 
Pharmaceutical Wholesale
5,738

 
5,755

 
11,446

 
11,473

 
 
 
 
 
 
 
 
Eliminations1
(549
)
 
(529
)
 
(1,086
)
 
(1,079
)
 
 
 
 
 
 
 
 
Walgreens Boots Alliance, Inc.
$
34,528

 
$
33,021

 
$
68,321

 
$
63,761


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.