Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Abstract]
Effective income tax rate	(37.20%)	1.50%	15.80%
Unrecognized benefit that would affect the effective tax rate	$ 1
Amount of interest and penalties included in liabilities for uncertain tax positions	1
Income tax paid			$ 4
Income tax refund	$ 3	$ 19