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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of the Company's intangible assets
The following table is a summary of the Company’s intangible assets as of December 31:
 
 
2013
 
2012
In millions 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Trademark (indefinitely-lived)
$
6,398

 
$
—

 
$
6,398

 
$
6,398

 
$
—

 
$
6,398

Customer contracts and relationships and covenants not to compete
5,840

 
(3,083
)
 
2,757

 
5,745

 
(2,812
)
 
2,933

Favorable leases and other
800

 
(426
)
 
374

 
802

 
(380
)
 
422

 
$
13,038

 
$
(3,509
)
 
$
9,529

 
$
12,945

 
$
(3,192
)
 
$
9,753