Provision For Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Liability for Uncertainty in Income Taxes, Noncurrent	$ 5		$ 5
Provision for income taxes	(12)	$ (13)	(19)	$ (16)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	22	31	(49)	58
Unrecognized Tax Benefits	13		13
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6		6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2		2		$ 2
Jurisdictions where valuation allowances are maintained [Member]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest			(106)	(46)
Domestic Country And Foreign Country Witholding Taxes [Member]
Liability for Uncertainty in Income Taxes, Noncurrent	$ 3		$ 3
Deferred Tax Liabilities, Net		$ 12		$ 12