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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
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)