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Commitments and Contingencies - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 12, 2024 USD ($) | Oct. 31, 2022 claim | Nov. 30, 2021 claim | Apr. 30, 2021 claim | Mar. 31, 2025 USD ($) claim state subsidiary | Mar. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) defendant claim state subsidiary | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | 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 |  |  | $ 7 |  |  |
Loss contingency, number of subsidiaries in civil enforcement action | subsidiary |  |  |  |  |  |  |  |  |  |  |  | 2 |
Insurance receivables for asbestos-related liabilities | $ |  |  |  |  | 8 | $ 0 | 12 | $ 0 |  |  |  |  |
Reserve for environmental liabilities, current | $ |  |  |  |  | $ 25 |  | $ 25 |  |  | $ 32 |  |  |
Loss contingency, number of tribal corporations | corporation |  |  |  |  |  |  |  |  |  |  |  |  | 2
FTC-Related Remediation and Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  |  |  |  |  |  |  |  |  |  | 6 |  |
Aqueous Film Forming Foam ("AFFF") Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of subsidiaries named in lawsuits | subsidiary |  |  |  |  | 2 |  | 2 |  |  |  |  |  |
AFFF Putative Class Actions |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  |  |  |  | 46 |  | 46 |  |  |  |  |  |
Loss contingency, proposed claims, number |  |  |  |  | 6 |  | 6 |  |  |  |  |  |
Loss contingency, pending claims, number of states originated from | state |  |  |  |  | 19 |  | 19 |  |  |  |  |  |
AFFF Individual or Mass Actions |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  |  |  |  | 7,510 |  | 7,510 |  |  |  |  |  |
Loss contingency, pending claims, number of states originated from | state |  |  |  |  | 52 |  | 52 |  |  |  |  |  |
AFFF Individual or Mass Actions | Colorado |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of defendants | defendant |  |  |  |  |  |  | 7,000 |  |  |  |  |  |
AFFF Individual or Mass Actions | United States, Excluding Colorado |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of defendants | defendant |  |  |  |  |  |  | 7,510 |  |  |  |  |  |
AFFF Municipal and Water Provider Cases |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  |  |  |  | 1,010 |  | 1,010 |  |  |  |  |  |
Loss contingency, pending claims, number of states originated from | state |  |  |  |  | 35 |  | 35 |  |  |  |  |  |
Water Provider AFFF Settlement Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution to resolve settlement | $ | $ 750 |  |  |  |  |  |  |  |  |  |  |  |
Reserve for environmental liabilities, current | $ |  |  |  |  |  |  |  |  | $ 415 |  |  |  |
State or U.S. Territory Attorneys General Litigation Related to AFFF |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  |  |  |  | 35 |  | 35 |  |  |  |  |  |
Loss contingency, pending claims, number of states originated from | state |  |  |  |  | 33 |  | 33 |  |  |  |  |  |
State or U.S. Territory Attorneys General Litigation Related to AFFF | Alaska |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  |  |  | 2 |  |  |  |  |  |  |  |  |
Loss contingency, number of pending claims transferred to MDL |  |  |  | 2 |  |  |  |  |  |  |  |  |
State or U.S. Territory Attorneys General Litigation Related to AFFF | North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, pending claims, number |  | 2 | 4 |  |  |  |  |  |  |  |  |  |
Loss contingency, number of pending claims transferred to MDL |  | 2 | 4 |  |  |  |  |  |  |  |  |  |

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