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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Capital loss carryforwards | $ 497 | $ 542
Deferred tax assets, net operating loss carryforwards | 428 | 447
Deferred tax assets, accrued liabilities | 191 | 194
Deferred tax assets, asset retirement obligations | 181 | 148
Other, including tax credits | 28 | 25
Total deferred tax assets before valuation allowance | 1,325 | 1,356
Less: valuation allowance | (794) | (826)
Net deferred tax assets | 531 | 530
Deferred tax liabilities, property and equipment | (2,669) | (2,304)
Deferred tax liabilities, fair value of derivative financial instruments | (6) | (50)
Deferred tax liabilities, other | (4) | (14)
Total deferred tax liabilities | (2,679) | (2,368)
Net deferred tax liability | $ (2,148) | $ (1,838)

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