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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Current income tax expense (benefit)	$ 2	$ 13	$ (1)	$ 14
Deferred income tax expense (benefit)	69		(38)	(4)
Total income tax expense (benefit)	$ 71	$ 13	$ (39)	$ 10
U.S. statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes	8.00%	(1.00%)	4.00%	(1.00%)
Other	1.00%	3.00%	(7.00%)	(2.00%)
Deferred tax asset valuation allowance		(26.00%)		(19.00%)
Effective income tax rate	30.00%	(3.00%)	18.00%	(1.00%)

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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