Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Loss from continuing operations before income taxes	$ (32)	$ (2,107)
Current income tax benefit	(5)	(106)
Deferred income tax benefit	(243)	(311)
Total income tax benefit	$ (248)	$ (417)
U.S. statutory income tax rate	21.00%	21.00%
State income taxes	(1.00%)	1.00%
Change in tax legislation	0.00%	5.00%
Unrecognized tax benefits	0.00%	0.00%
Other	(48.00%)	(3.00%)
Deferred tax asset valuation allowance	791.00%	(4.00%)
Effective income tax rate	763.00%	20.00%

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