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Merger Transaction and Integration Costs (Tables)
 9 Months Ended
Sep. 30, 2013
Business Combinations [Abstract]  
Merger Transaction and Integration Costs
The following table sets forth merger transaction and integration costs recognized for the three and nine months ended September 30, 2013, and 2012.
 
Three Months Ended September 30,
Nine Months Ended September 30,
 
2013
2012
2013
2012
 
(in millions)
Merger transaction costs
$
2

$
4

$
21

$
4

Merger integration costs
13

—

41

—

Total merger related costs
$
15

$
4

$
62

$
4