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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Earnings (loss) from continuing operations before income taxes | $ (3,090) | $ (109) | $ 944
U.S. statutory income tax rate | 21.00% | 21.00% | 21.00%
Change in tax legislation | 4.00% | 0.00% | 0.00%
State income taxes | 1.00% | 24.00% | 5.00%
Change in unrecognized tax benefits | 0.00% | (13.00%) | (2.00%)
Audit settlements | 0.00% | 15.00% | (2.00%)
Other | (1.00%) | (19.00%) | 2.00%
Deferred tax asset valuation allowance | (7.00%) | 0.00% | 0.00%
Effective income tax rate | 18.00% | 28.00% | 24.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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