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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Property, Plant and Equipment |  |
Utility | $ 6,082 | $ 5,550
Non-utility | 7,046 | 6,656
Total property, plant and equipment | 13,128 | 12,206
Distribution |  |
Property, Plant and Equipment |  |
Utility | 5,204 | 4,746
Transmission |  |
Property, Plant and Equipment |  |
Utility | 123 | 123
General and other |  |
Property, Plant and Equipment |  |
Utility | 660 | 557
Work in process |  |
Property, Plant and Equipment |  |
Utility | 95 | 124
Non-utility | 156 | 53
Land |  |
Property, Plant and Equipment |  |
Non-utility | 174 | 179
Buildings and improvements |  |
Property, Plant and Equipment |  |
Non-utility | $ 418 | 426
Buildings and improvements | Minimum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 10 years |
Buildings and improvements | Maximum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 40 years |
Transportation equipment |  |
Property, Plant and Equipment |  |
Non-utility | $ 238 | 234
Transportation equipment | Minimum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 3 years |
Transportation equipment | Maximum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 10 years |
Equipment, primarily cylinders and tanks |  |
Property, Plant and Equipment |  |
Non-utility | $ 3,903 | 3,645
Equipment, primarily cylinders and tanks | Minimum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 5 years |
Equipment, primarily cylinders and tanks | Maximum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 30 years |
Electric generation |  |
Property, Plant and Equipment |  |
Non-utility | $ 190 | 216
Electric generation | Minimum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 25 years |
Electric generation | Maximum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 40 years |
Pipeline and related assets |  |
Property, Plant and Equipment |  |
Non-utility | $ 1,577 | 1,523
Pipeline and related assets | Minimum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 25 years |
Pipeline and related assets | Maximum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 40 years |
Other |  |
Property, Plant and Equipment |  |
Non-utility | $ 390 | $ 380
Other | Minimum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 1 year |
Other | Maximum |  |
Property, Plant and Equipment |  |
Estimated Useful Life | 12 years |

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- Definition Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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