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Acquisitions and Dispositions (Tables)
 6 Months Ended
Jun. 30, 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:
 
 
Six months ended June 30,
(millions)
 
2013
 
2012
Consideration
 
$
23

 
$
96

Intangible assets:
 
 

 
 

Goodwill
 
$
16

 
$
57

Other intangible assets
 
11

 
42

     Total
 
$
27

 
$
99