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Summary of Significant Accounting Policies - Refundable Tank and Cylinder Deposits and Environmental Matters (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
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Accounting Policies [Abstract] |  |
Customer paid deposits primarily on owned tanks and cylinders | $ 243 | $ 296
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Environmental Loss Contingency, Statement of Financial Position Extensible Enumeration Not Disclosed Flag [Member] |

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- Definition Foreign subsidiary tank and cylinder customer deposits. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
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- Definition Indicates line item in statement of financial position that includes accrual for environmental loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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Period Type: | instant