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Commitments and Contingencies - Narrative (Detail) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2024 USD ($) | Dec. 31, 2024 USD ($) | Oct. 31, 2022 claim | Nov. 30, 2021 claim | Apr. 30, 2021 claim | Sep. 30, 2025 USD ($) claim state subsidiary | Sep. 30, 2024 USD ($) | Nov. 30, 2022 claim | Mar. 31, 2022 subsidiary | Mar. 31, 2020 corporation
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental loss contingencies payment period |  |  |  |  |  | 20 years |  |  |  |
Conditional asset retirement obligations | $ |  |  |  |  |  | $ 7 | $ 7 |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  |  |  | 2 |
Reserve for environmental liabilities, current | $ |  |  |  |  |  | 27 | 32 |  |  |
Insurance receivables for asbestos-related liabilities | $ |  |  |  |  |  | $ 44 | $ 47 |  |  |
Number of tribal corporations filing lawsuits | corporation |  |  |  |  |  |  |  |  |  | 2
FTC-Related Remediation And Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  |  |  |  |  |  | 6 |  |
Aqueous Film Forming Foam Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of subsidiaries named | subsidiary |  |  |  |  |  | 2 |  |  |  |
Aqueous Film Forming Foam Municipal And Water Provider Cases |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  |  |  |  | 280 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 36 |  |  |  |
Water Provider AFFF Settlement Agreement |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party | $ | $ 750 |  |  |  |  |  |  |  |  |
Payments of settlements | $ |  | $ 415 |  |  |  |  |  |  |  |
Aqueous Film Forming Foam Putative Class Actions |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  |  |  |  | 49 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 20 |  |  |  |
Proposed claims |  |  |  |  |  | 7 |  |  |  |
Aqueous Film Forming Foam Individual Or Mass Actions |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  |  |  |  | 12,400 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 53 |  |  |  |
State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  |  |  |  | 35 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 33 |  |  |  |
State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam | ALASKA |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  |  |  | 2 |  |  |  |  |
Number of transferred cases |  |  |  |  | 2 |  |  |  |  |
State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam | NORTH CAROLINA |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of actions filed |  |  | 2 | 4 |  |  |  |  |  |
Number of transferred cases |  |  | 2 | 4 |  |  |  |  |  |

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