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Restructuring Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring Costs [Abstract]  
Changes In Restructuring Reserve



 

 

 

 



 

 

 

 



 

 

 

 



 

Restructuring

 

($ in millions)

 

Liability

 

Balance, January 1, 2016

 

$

 1 

 

Severance costs

 

 

 65 

 

Cash payments during the period

 

 

 (19)

 

Balance, December 31, 2016

 

 

 47 

 

Severance costs

 

 

 68 

 

Cash payments during the period

 

 

 (90)

 

Balance, December 31, 2017

 

$

 25