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Restructuring and Other Termination Costs (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Summary of restructuring liabilities
The following table summarizes our restructuring liabilities:
 
 
Other Current Liabilities
 
 
($ in millions)
Balance as of December 31, 2017
 
$
—

Initial restructuring recognition on January 30, 2018
 
38

Termination benefits paid
 
(38
)
Balance as of December 31, 2018
 
$
—