Restructuring Costs (Tables)

3 Months Ended

Mar. 31, 2017

Restructuring and Related Activities [Abstract]

Restructuring Reserve Rollforward [Table Text Block]

($ in millions)
	Restructuring Liability
Balance, January 1, 2017	$	47
Severance costs		12
Cash payments during the period		(50)
Balance, March  31, 2017	$	9