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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Capital loss carryforwards | $ 547 |
Investment in subsidiary | 441 |
Deferred tax assets, net operating loss carryforwards | 238 | $ 306
Deferred tax assets, accrued liabilities | 125 | 35
Deferred tax assets, asset retirement obligations | 94 | 123
Deferred tax assets, pension benefit obligations | 43 | 39
Other | 96 | 66
Total deferred tax assets before valuation allowance | 1,584 | 569
Less: valuation allowance | (1,355) | (106)
Net deferred tax assets | 229 | 463
Deferred tax liabilities, property and equipment | (213) | (800)
Deferred tax liabilities, other |  | (4)
Total deferred tax liabilities | (213) | (804)
Net deferred tax asset (liability) | $ 16 |
Net deferred tax asset (liability) |  | $ (341)

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