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Goodwill
 3 Months Ended
Mar. 31, 2014
Goodwill [Abstract]  
Goodwill
Goodwill

Below is a summary of the changes in the carrying amount of goodwill by segment for the three months ended March 31, 2014:
In millions
Pharmacy Services
 
Retail Pharmacy
 
Total
Balance, December 31, 2013
$
19,658

 
$
6,884

 
$
26,542

Acquisition
1,593

 
—

 
1,593

Foreign currency translation adjustments
—

 
5

 
5

Other (1)
(1
)
 
—

 
(1
)
Balance, March 31, 2014
$
21,250

 
$
6,889

 
$
28,139


(1) "Other" represents immaterial purchase accounting adjustments for acquisitions.