Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Allocation

Income Tax Allocation
	Three Months Ended March 31,
(Dollars in millions)	2018			2017
Loss before income taxes	$	(21	)	$	(461	)
Income tax provision	$	(13	)	$	(47	)
Effective tax rate	(61.9		)%	(10.2		)%