Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended			3 Months Ended	6 Months Ended
	Oct. 31, 2022 claim	Nov. 30, 2021 claim	Apr. 30, 2021 claim	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($) state claim defendant subsidiary	Nov. 30, 2022 claim	Mar. 31, 2022 subsidiary	Aug. 31, 2020 claim
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, period increase (decrease) | $				$ 228
Environmental loss contingencies payment period				20 years
Environmental loss contingencies, remediation period				20 years
Conditional asset retirement obligations | $				$ 17	$ 17
FTC-Related Remediation and Litigation
Loss Contingencies [Line Items]
Loss contingency, number of subsidiaries in civil enforcement action | subsidiary							2
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
AFFF Putative Class Actions
Loss Contingencies [Line Items]
Loss contingency, pending claims, number					39
Loss contingency, pending claims, number of states originated from | state					15
AFFF Individual or Mass Actions
Loss Contingencies [Line Items]
Loss contingency, pending claims, number					3,900
Loss contingency, pending claims, number of states originated from | state					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					3,900
AFFF Municipal and Water Provider Cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number					350
Loss contingency, pending claims, number of states originated from | state					30
State or U.S. Territory Attorneys General Litigation Related to AFFF | Michigan
Loss Contingencies [Line Items]
Loss contingency, pending claims, number								2
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