Company Restructuring (Tables)

9 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

Schedule of changes in the restructuring liability

Restructuring activity during the period
($ in millions)	Employee costs			Exit costs			Total liability
Restructuring liability as of December 31, 2018	$	29		$	15		$	44
Expense incurred	31			3			34
Adjustments to liability	(7		)	—			(7		)
Payments	(37		)	(7		)	(44		)
Restructuring liability as of September 30, 2019	$	16		$	11		$	27