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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Capital loss carryforwards | $ 542 | $ 523
Deferred tax assets, net operating loss carryforwards | 447 | 526
Deferred tax assets, accrued liabilities | 194 | 209
Deferred tax assets, asset retirement obligations | 148 | 119
Other, including tax credits | 25 | 14
Total deferred tax assets before valuation allowance | 1,356 | 1,391
Less: valuation allowance | (826) | (814)
Net deferred tax assets | 530 | 577
Deferred tax liabilities, property and equipment | (2,304) | (1,969)
Deferred tax liabilities, fair value of derivative financial instruments | (50) | (33)
Deferred tax liabilities, other | (14) | (38)
Total deferred tax liabilities | (2,368) | (2,040)
Net deferred tax liability | $ (1,838) | $ (1,463)

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