Income Taxes (Tables)

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Tax Expense (Benefit) and Effective Tax Rate

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2019			2018			2019			2018
	(Dollars in millions)
Tax expense (benefit)	$	34		$	(856	)	$	79		$	(844	)
Effective tax rate		47	%		(1,173	)%		31	%		(288	)%