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Commitments and Contingencies - Narrative (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 12, 2024 USD ($) | Jun. 30, 2024 USD ($) | Oct. 31, 2022 claim | Nov. 30, 2021 claim | Apr. 30, 2021 claim | Sep. 30, 2024 USD ($) state subsidiary claim | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) state defendant subsidiary claim | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Nov. 30, 2022 claim | Mar. 31, 2022 subsidiary
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Environmental loss contingencies payment period |  |  |  |  |  |  |  | 20 years |  |  |  |
Conditional asset retirement obligations |  |  |  |  |  | $ 7 |  | $ 7 | $ 8 |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  |  |  |  |  |  | 2
Reserve for environmental liabilities, current |  |  |  |  |  | 32 |  | 32 | 28 |  |  |
Insurance receivables for asbestos-related liabilities |  |  |  |  |  | 47 |  | 47 | 50 |  |  |
Insurance receivables for asbestos-related liabilities |  |  |  |  |  |  |  | 367 | $ 0 | $ 0 |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables for asbestos-related liabilities |  |  |  |  |  | $ 371 |  | 371 |  |  |  |
Insurance receivables for asbestos-related liabilities |  |  |  |  |  |  |  | $ 349 |  |  |  |
FTC-Related Remediation And Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of actions filed | claim |  |  |  |  |  |  |  |  |  |  | 6 |
Aqueous Film Forming Foam Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries named | subsidiary |  |  |  |  |  | 2 |  | 2 |  |  |  |
Aqueous Film Forming Foam Municipal And Water Provider Cases |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of actions filed | claim |  |  |  |  |  | 970 |  | 970 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 35 |  | 35 |  |  |  |
Water Provider AFFF Settlement Agreement |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded to other party | $ 750 |  |  |  |  |  |  |  |  |  |  |
Settlement charge |  |  |  |  |  |  | $ 750 |  |  |  |  |
Initial payment |  | $ 250 |  |  |  | $ 85 |  |  |  |  |  |
Reserve for environmental liabilities, current |  | $ 500 |  |  |  | $ 415 | $ 500 | $ 415 |  |  |  |
Aqueous Film Forming Foam Putative Class Actions |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of actions filed | claim |  |  |  |  |  | 45 |  | 45 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 18 |  | 18 |  |  |  |
Aqueous Film Forming Foam Individual Or Mass Actions |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of actions filed | claim |  |  |  |  |  | 8,300 |  | 8,300 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 52 |  | 52 |  |  |  |
Aqueous Film Forming Foam Individual Or Mass Actions | COLORADO |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | defendant |  |  |  |  |  |  |  | 7,000 |  |  |  |
Aqueous Film Forming Foam Individual Or Mass Actions | United States, Excluding Colorado |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | defendant |  |  |  |  |  |  |  | 8,300 |  |  |  |
State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of actions filed | claim |  |  |  |  |  | 35 |  | 35 |  |  |  |
Number of states and territories | state |  |  |  |  |  | 33 |  | 33 |  |  |  |
State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam | ALASKA |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of actions filed | claim |  |  |  |  | 2 |  |  |  |  |  |  |
Number of transferred cases | claim |  |  |  |  | 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 | claim |  |  | 2 | 4 |  |  |  |  |  |  |  |
Number of transferred cases | claim |  |  | 2 | 4 |  |  |  |  |  |  |  |

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