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Company Restructuring (Tables)
 9 Months Ended
Sep. 30, 2017
Restructuring and Related Activities [Abstract]  
Schedule of changes in the restructuring liability
The following table presents changes in the restructuring liability during the nine months ended September 30, 2017.
($ in millions)
Employee
costs
 
Exit
costs
 
Total
liability
Balance as of December 31, 2016
$
—

 
$
2

 
$
2

Expense incurred
46

 
18

 
64

Adjustments to liability
(4
)
 
—

 
(4
)
Payments applied against liability
(24
)
 
(7
)
 
(31
)
Balance as of September 30, 2017
$
18

 
$
13

 
$
31