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Goodwill and Intangible Assets Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
Below is a summary of the changes in the carrying amount of goodwill by segment for the nine months ended September 30, 2014:
In millions
Pharmacy Services
 
Retail Pharmacy
 
Total
Balance, December 31, 2013
$
19,658

 
$
6,884

 
$
26,542

Acquisitions
1,577

 
38

 
1,615

Foreign currency translation adjustments
—

 
(5
)
 
(5
)
Other (1)
(1
)
 
—

 
(1
)
Balance, September 30, 2014
$
21,234

 
$
6,917

 
$
28,151


(1) "Other" represents immaterial purchase accounting adjustments for acquisitions.
Schedule of Intangible Assets, Excluding Goodwill [Table Text Block]
The following is a summary of the Company's intangible assets as of September 30, 2014 and December 31, 2013:
 
September 30, 2014
 
December 31, 2013
In millions
Gross
Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross
Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Trademarks (indefinitely-lived)
$
6,398

 
$
—

 
$
6,398

 
$
6,398

 
$
—

 
$
6,398

Customer contracts and
  relationships and covenants not
  to compete
6,465

 
(3,434
)
 
3,031

 
5,840

 
(3,083
)
 
2,757

Favorable leases and other
888

 
(463
)
 
425

 
800

 
(426
)
 
374

 
$
13,751

 
$
(3,897
)
 
$
9,854

 
$
13,038

 
$
(3,509
)
 
$
9,529