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Goodwill and Intangible Assets Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2013
Finite-Lived Intangible Assets, Net [Abstract]  
Schedule of Finite-Lived Intangible Assets
The following is a summary of the Company's intangible assets as of September 30, 2013 and December 31, 2012:
 
September 30, 2013
 
December 31, 2012
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
5,947

 
(3,144
)
 
2,803

 
5,745

 
(2,812
)
 
2,933

Favorable leases and other
803

 
(417
)
 
386

 
802

 
(380
)
 
422

 
$
13,148

 
$
(3,561
)
 
$
9,587

 
$
12,945

 
$
(3,192
)
 
$
9,753