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Income Taxes (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes |  |  |  |  |
Effective tax rate of income (loss) before income taxes |  | 24.10% | 22.80% | 24.00% | 23.50%
Permanent differences for tax purposes |  | $ 10 |  | $ 16 |
Excess tax benefits associated with equity-based compensation |  | 1 | $ 5 | 11 | $ 17
Equity in net losses of unconsolidated entities |  | 18 | 17 | 41 | 49
Alternative fuel tax credits | $ 26 |  |  |  |
Low income housing investments [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Equity in net losses of unconsolidated entities |  | 18 | 16 | 43 | 47
Income tax benefit from low-income housing investments |  | 28 | 26 | 76 | 74
Interest expense |  | $ 3 | $ 5 | $ 10 | $ 10

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