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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
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)