Restructuring Costs (Tables)

12 Months Ended

Dec. 31, 2016

Restructuring Costs [Abstract]

Restructuring Reserve Rollforward (Table)

($ in millions)
	Restructuring Liability
Balance, January 1, 2016	$	1
Severance costs		65
Cash payments during the period		(19)
Balance, December 31, 2016	$	47