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Income Taxes - Additional information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2024 | Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Taxes |  |  |  |  |
Income tax expense at U.S. federal statutory rate |  |  | 21.00% | 21.00% | 21.00%
Equity in net losses of unconsolidated entities |  |  | $ (4) | $ 60 | $ 67
Compensation expense recognized, tax benefit |  |  | 18 | 15 | 14
Increase (decrease) in provision for income taxes due to impairments |  |  | 14 | 50 |
Renewable Natural Gas [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Tax credits and adjustments |  |  | 137 | 8 |
Low income housing investments [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Investment proportional amortization tax impact |  |  | 78 |  |
Equity in net losses of unconsolidated entities |  |  |  | 66 | 65
Income tax benefit from low-income housing investments |  |  | $ 104 | $ 108 | $ 99
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit)
Investment Program Proportional Amortization Method Elected, Income Tax Credit and Other Income Tax Benefit Before Amortization, Statement of Cash Flows Extensible Enumeration, Not Disclosed Flag |  |  | true |  |
Variable interest entities interest expense |  |  | $ 24 | $ 15 | $ 14
Consideration for investment | $ 426 |  |  |  |
Investment cash payment | 33 |  |  |  |
Interest payable | 77 |  |  |  |
Increase (decrease) investments in unconsolidated entities | $ 349 |  |  |  |
Tax Year 2017 [Member] |  |  |  |  |
Income Taxes |  |  |  |  |
Income tax deposit paid |  | $ 103 |  |  |

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