Income Taxes (Jurisdictional Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Taxes (Jurisdictional components of deferred taxes)
Deferred Tax Assets, Gross	$ 18	$ 20
Valuation allowance, asset	0	(1)
Net deferred income tax assets (liabilities)	18	19
U.S. Federal [Member]
Income Taxes (Jurisdictional components of deferred taxes)
Operating Loss Carryforwards	1,500
Deferred Tax Assets, Gross	25	25
Valuation allowance, asset	0	0
Net deferred income tax assets (liabilities)	25	25
State and Local Jurisdiction [Member]
Income Taxes (Jurisdictional components of deferred taxes)
Operating Loss Carryforwards	600
Deferred Tax Assets, Gross	1	1
Valuation allowance, asset	0	0
Net deferred income tax assets (liabilities)	1	1
Foreign Tax Authority [Member]
Income Taxes (Jurisdictional components of deferred taxes)
Operating Loss Carryforwards	48
Deferred Tax Assets, Gross	(8)	(6)
Valuation allowance, asset	0	(1)
Deferred Tax Liabilities, Net	(8)	$ (7)
Share-based Payment Arrangement [Member]
Income Taxes (Jurisdictional components of deferred taxes)
Operating Loss Carryforwards	$ 237