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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]    
Deferred tax assets, net operating loss carryforwards $ 526 $ 1,075
Capital loss carryforwards 523 559
Deferred tax assets, accrued liabilities 209 262
Fair value of derivative financial instruments 0 129
Deferred tax assets, asset retirement obligations 119 109
Other, including tax credits 14 138
Total deferred tax assets before valuation allowance 1,391 2,272
Less: valuation allowance (814) (893)
Net deferred tax assets 577 1,379
Deferred tax liabilities, property and equipment (1,969) (1,630)
Deferred tax liabilities, fair value of derivative financial instruments (33) 0
Deferred tax liabilities, other (38) (29)
Total deferred tax liabilities (2,040) (1,659)
Net deferred tax asset (liability) $ (1,463) $ (280)