Company Restructuring (Tables)

3 Months Ended

Mar. 31, 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	16			—			16
Adjustments to liability	2			—			2
Payments	(11		)	(4		)	(15		)
Restructuring liability as of March 31, 2019	$	36		$	11		$	47