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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Earnings (loss) from continuing operations before income taxes	$ 304	$ (680)	$ 272	$ (2,787)
Current income tax expense (benefit)	19	(3)	14	(109)
Deferred income tax expense (benefit)	24		(219)	(311)
Total income tax expense (benefit)	$ 43	$ (3)	$ (205)	$ (420)
U.S. statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes	0.00%	0.00%	1.00%	1.00%
Subsidiary reorganization	6.00%	0.00%	7.00%	0.00%
Deferred tax asset valuation allowance	(19.00%)	(20.00%)	(116.00%)	(8.00%)
Other	6.00%	(1.00%)	12.00%	1.00%
Effective income tax rate	14.00%	0.00%	(75.00%)	15.00%

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