Company Restructuring (Tables)

12 Months Ended

Dec. 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	43			7			50
Adjustments to liability	(9		)	—			(9		)
Payments and non-cash pension settlements	(49		)	(14		)	(63		)
Restructuring liability as of December 31, 2019	$	14		$	8		$	22