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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Taxes |  |  |  |
Effective tax rate of income (loss) before income taxes | 22.20% | 23.60% | 21.00% | 22.20%
Tax credits and adjustments | $ 49 | $ 37 | $ 138 | $ 111
Low income housing investments [Member] |  |  |  |
Income Taxes |  |  |  |
Investment proportional amortization tax impact | 26 | 19 | 71 | 56
Income tax benefit from low-income housing investments | 37 | 26 | 99 | 76
Variable interest entities interest expense | 8 | $ 5 | 25 | $ 16
Renewable Natural Gas [Member] |  |  |  |
Income Taxes |  |  |  |
Increase (decrease) to accruals and related deferred taxes | $ 22 |  | $ 22 |

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