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Intangible Assets
 12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Activity related to intangible assets, net consisted of the following:
 
Customer
Relations
 
Trade Names
 
Total
Balance at January 1, 2011
$
707

 
$
63

 
$
770

Amortization
(26
)
 
(3
)
 
(29
)
Balance at December 31, 2011
681

 
60

 
741

Amortization
(26
)
 
(3
)
 
(29
)
Balance at December 31, 2012
$
655

 
$
57

 
$
712


The average remaining amortization periods for customer relations and trade names are 25 and 17 years, respectively. The expected amortization of the intangible assets for each of the five succeeding years is $29 million.