Company Restructuring (Tables)

6 Months Ended

Jun. 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	29			2			31
Adjustments to liability	(4		)	—			(4		)
Payments	(24		)	(6		)	(30		)
Restructuring liability as of June 30, 2019	$	30		$	11		$	41