Discontinued Operations (Tables)

6 Months Ended

Jun. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations [Table Text Block]

Select financial information of discontinued operations is summarized below.

	Three months ended June 30,						Six months ended June 30,
($ in millions)	2017			2016			2017			2016
Pretax (loss) income	$	(2	)	$	(2	)	$	(1	)	$	2
Tax benefit	—			(5		)	—			(4		)