Company Restructuring (Tables)

12 Months Ended

Dec. 31, 2016

Restructuring and Related Activities [Abstract]

Schedule of changes in the restructuring liability

The following table presents changes in the restructuring liability in 2016.

($ in millions)	Employee costs			Exit costs			Total liability
Balance as of December 31, 2015	$	1		$	1		$	2
Expense incurred	8			6			14
Payments applied against liability	(9		)	(5		)	(14		)
Balance as of December 31, 2016	$	—		$	2		$	2