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Restructuring and Other Charges (Tables)
3 Months Ended
Mar. 31, 2013
Restructuring Reserve [Abstract]  
Roll Forward of Restructuring Reserve
Amounts related to activities that are part of our restructuring reserves are as follows:
 
December 31,
2012
Restructuring
Reserve
 
2013
Expenses
 
2013
Cash
Payments
 
March 31,
2013
Restructuring
Reserve
 
(Millions)
Employee Severance and Termination Benefits

$—

 

$4

 

($4
)
 

$—