Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in valuation allowance	$ (17)	$ (9)	$ 3
Provisional adjustment of income tax benefit			$ 591
Domestic Tax Authority [Member]
Tax Credit Carryforward, Amount	2
Operating Loss Carryforwards	539
Foreign Tax Authority [Member]
Tax Credit Carryforward, Amount	4
Change in valuation allowance	19
Operating Loss Carryforwards	217
State and Local Jurisdiction [Member]
Tax Credit Carryforward, Amount	19
Operating Loss Carryforwards	$ 613