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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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