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Merger Transaction and Integration Costs (Tables)
 6 Months Ended
Jun. 30, 2014
Business Combinations [Abstract]  
Merger Transaction and Integration Costs
The following table sets forth merger integration and transaction costs recognized for the three and six months ended June 30, 2014 and 2013.
 
Three Months Ended June 30,
Six Months Ended June 30,
 
2014
2013
2014
2013
 
(in millions)
Merger integration costs
$
8

$
28

$
26

$
28

Merger transaction costs
—

9

—

19

Total merger related costs
$
8

$
37

$
26

$
47