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Business Restructuring (Tables)
 9 Months Ended
Sep. 30, 2019
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
The following table summarizes the reserve activity for the nine months ended September 30, 2019:
($ in millions)
Total Reserve
December 31, 2018

$110

2019 restructuring charges
194

Cash payments
(35
)
Release of prior reserves and other adjustments
(19
)
Foreign currency impact
(8
)
September 30, 2019

$242