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Sales
 9 Months Ended
May 31, 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 May 31,
 
Nine months ended May 31,
 
2019
 
2018
 
2019
 
2018
Retail Pharmacy USA
 
 
 
 
 
 
 
Pharmacy
$
19,585

 
$
18,790

 
$
57,624

 
$
52,258

Retail
6,928

 
7,127

 
20,867

 
20,626

Total
26,513

 
25,917

 
78,491

 
72,884

 
 
 
 
 
 
 
 
Retail Pharmacy International
 
 
 
 
 
 
 
Pharmacy
1,047

 
1,111

 
3,096

 
3,316

Retail
1,730

 
1,884

 
5,662

 
6,079

Total
2,776

 
2,995

 
8,759

 
9,395

 
 
 
 
 
 
 
 
Pharmaceutical Wholesale
5,865

 
5,965

 
17,311

 
17,438

 
 
 
 
 
 
 
 
Eliminations1
(563
)
 
(543
)
 
(1,649
)
 
(1,622
)
 
 
 
 
 
 
 
 
Walgreens Boots Alliance, Inc.
$
34,591

 
$
34,334

 
$
102,912

 
$
98,095


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.