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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2014
Goodwill [Abstract]  
Schedule of Goodwill
Below is a summary of the changes in the carrying amount of goodwill by segment for the six months ended June 30, 2014:
In millions
Pharmacy Services
 
Retail Pharmacy
 
Total
Balance, December 31, 2013
$
19,658

 
$
6,884

 
$
26,542

Acquisitions
1,576

 
—

 
1,576

Foreign currency translation adjustments
—

 
9

 
9

Other (1)
(1
)
 
—

 
(1
)
Balance, June 30, 2014
$
21,233

 
$
6,893

 
$
28,126


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