Income Tax (Tables)

3 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Effective Tax Rate

Effective Tax Rate

	Three Months Ended December 31
	2018			2017
	(Dollars in millions)
(Provision) benefit for income taxes	$	7		$	(205	)
Effective tax rate		(10	)%		224	%