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Income Taxes - Summary of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Deferred tax liabilities:    
Attributable to investment in OTA $ 495 $ 462
Attributable to property, plant and equipment 172 151
Attributable to investments in other entities 4 5
Other 107 98
Total deferred tax liabilities 778 716
Deferred tax assets:    
Net operating loss carryovers 73 56
Temporary differences related to Texas Margin Tax 3 4
Total deferred tax assets 76 60
Total net deferred tax liabilities $ 702 $ 656