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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Deferred tax assets, net operating loss carryforwards $ 1,075 $ 238
Capital loss carryforwards 559 547
Deferred tax assets, accrued liabilities 262 125
Fair value of derivative financial instruments 129 33
Deferred tax assets, asset retirement obligations 109 94
Investment in subsidiary   441
Other, including tax credits 138 106
Total deferred tax assets before valuation allowance 2,272 1,584
Less: valuation allowance (893) (1,355)
Net deferred tax assets 1,379 229
Deferred tax liabilities, property and equipment (1,630) (213)
Deferred tax liabilities, other (29)  
Total deferred tax liabilities (1,659) (213)
Net deferred tax asset (liability) $ 280 $ 16