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Summary of Significant Accounting Policies - Landfill (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) item site | Dec. 31, 2023 USD ($) | Dec. 31, 2022
Significant accounting policies |  |  |
Expansion landfill sites requiring CFO approval, unpermitted airspace | item | 1 |  |
Range of loss not accrued | $ 9 |  |
Environmental remediation liabilities | $ 222 |  |
Landfill [Member] |  |  |
Significant accounting policies |  |  |
Inflation rate | 2.50% | 2.50% | 2.50%
Environmental remediation accrual discount rate (as a percent) | 4.80% |  |
Landfills sites with expansion | site | 18 |  |
Landfill [Member] | Minimum [Member] |  |  |
Significant accounting policies |  |  |
Permit application process period | 1 year |  |
Landfill [Member] | Maximum [Member] |  |  |
Significant accounting policies |  |  |
Permit application process period | 5 years |  |
Environmental Remediation Liabilities [Member] |  |  |
Significant accounting policies |  |  |
Environmental remediation liabilities | $ 222 | $ 209 |

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