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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Deferred Tax Liabilities:        
Differences between book and tax basis of property $ (1,104)     $ (966)
Deferred Tax Liabilities, Investment in US Tax Partnerships (785)     (578)
Deferred income taxes 1,490 $ 1,696 $ 1,588 1,245
Other taxable temporary differences (438)     (403)
Deferred Tax Liabilities, Gross (2,327)     (1,947)
Deferred Tax Assets:        
Operating loss carryforwards 933     1,132
Capital loss carryforwards 501     65
Bad debt and other book provisions 91     92
Tax credit carryforwards 48     72
Other deductible temporary differences 542     409
Total gross deferred tax asset 2,115     1,770
Less: Valuation allowance (913)     (672)
Total net deferred tax asset 1,202     1,098
Total deferred tax liability (1,125)     $ (849)
General Business Tax Credit Carryforward        
Deferred Tax Assets:        
Tax credit carryforward 54      
Income Tax Disclosures [Line Items]        
Capital Loss Carryforwards $ 1,700