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Income Taxes - Schedule of Reconciliation of Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Pre-Tax Net Book Income (“NBI”) | $ 1,470 | $ 1,437 | $ 2,900 | $ 2,941
Texas Margin Tax | (11) | (10) | (30) | (27)
State income tax provision, net of federal benefit | 0 | 0 | (1) | 0
Federal income tax provision computed by applying the federal statutory rate to NBI of corporate entities | (5) | (5) | (9) | (8)
Other | 0 | 0 | 0 | (1)
Total provision for income taxes | $ (16) | $ (15) | $ (40) | $ (36)
Effective income tax rate | (1.10%) | (1.00%) | (1.40%) | (1.20%)

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- Definition The amount of income tax expense (benefit) for the period computed by applying the Texas margin tax. The tax is assessed on Texas sourced taxable margin which is defined as the lesser of (i) 70% of total revenue or (ii) total revenue less (a) cost of goods sold or (b) compensation and benefits. + References No definition available. + Details
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