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Merger Transaction and Integration Costs (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2013.
 
Three Months Ended June 30
Six Months Ended June 30
 
2013
2012
2013
2012
 
(in millions)
Merger transaction costs
$
9

$
—

$
19

$
—

Merger integration costs
28

—

28

—

Total merger related costs
$
37

$
—

$
47

$
—