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Acquisitions and Dispositions (Tables)
3 Months Ended
Mar. 31, 2013
Business Combinations [Abstract]  
Consideration transferred and preliminary value of intangible assets
The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions.
 
 
 
Three months ended March 31,
(millions)
 
2013
 
2012
Consideration
 
$
2

 
$
21

Intangible assets:
 
 

 
 

Goodwill
 
$
2

 
$
19

Other intangible assets
 
1

 
8

     Total
 
$
3

 
$
27