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Company Restructuring (Tables)
 3 Months Ended
Mar. 31, 2015
Restructuring and Related Activities [Abstract]  
Schedule of changes in the restructuring liability
The following table presents changes in the restructuring liability during the three months ended March 31, 2015.
($ in millions)
Employee
costs
 
Exit
costs
 
Total
liability
Balance as of December 31, 2014
$
3

 
$
1

 
$
4

Expense incurred
1

 
—

 
1

Adjustments to liability
(1
)
 
—

 
(1
)
Payments applied against liability
(1
)
 
—

 
(1
)
Balance as of March 31, 2015
$
2

 
$
1

 
$
3