Company Restructuring (Tables)

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Schedule of changes in the restructuring liability

The following table presents changes in the restructuring liability during the six months ended June 30, 2017.

($ in millions)	Employee costs			Exit costs			Total liability
Balance as of December 31, 2016	$	—		$	2		$	2
Expense incurred	36			16			52
Payments applied against liability	(2		)	(4		)	(6		)
Balance as of June 30, 2017	$	34		$	14		$	48