Income Taxes (Tables)

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Tax Expense (Benefit) and Effective Tax Rate

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020			2019			2020			2019
	(Dollars in millions)
Tax expense	$	11		$	21		$	12		$	45
Effective tax rate		550	%		24.1	%		21.8	%		24.5	%