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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Earnings (loss) from continuing operations before income taxes	$ (680)	$ 219	$ (2,787)	$ (278)
Current income tax expense (benefit)	(3)	3	(109)	(1)
Deferred income tax expense (benefit)		65	(311)	(50)
Total income tax expense (benefit)	$ (3)	$ 68	$ (420)	$ (51)
U.S. statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes	0.00%	9.00%	1.00%	3.00%
Change in tax legislation	0.00%	0.00%	3.00%	0.00%
Other	(1.00%)	1.00%	(2.00%)	(6.00%)
Deferred tax asset valuation allowance	(20.00%)	0.00%	(8.00%)	0.00%
Effective income tax rate	0.00%	31.00%	15.00%	18.00%

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in income tax legislation.

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