Income Tax (Tables)

3 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Effective Tax Rate

Effective Tax Rate

	Three Months Ended
	December 31,
	2016			2015
	(Dollars in millions)
Provision (benefit) for income taxes	$	17		$	(5	)
Effective tax rate		24	%		74	%