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Company Restructuring (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Schedule of changes in the restructuring liability
Changes in the restructuring liability
($ in millions)
 
Employee
costs
 
Exit
costs
 
Total
liability
Balance as of December 31, 2017
 
$
15

 
$
30

 
$
45

Expense incurred (1)
 
13

 
6

 
19

Adjustments to liability
 
—

 
(1
)
 
(1
)
Payments applied against liability
 
—

 
(3
)
 
(3
)
Balance as of March 31, 2018
 
$
28

 
$
32

 
$
60


(1) 
Certain expenses are expensed as incurred and are not included as part of changes in the restructuring liability. During the three months ended March 31, 2018, these expenses totaled $3 million.