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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Property, Plant and Equipment |  |
Utility | $ 7,034 | $ 6,520
Non-utility | 7,316 | 7,153
Total property, plant and equipment | 14,350 | 13,673
Distribution |  |
Property, Plant and Equipment |  |
Utility | 6,024 | 5,595
Transmission |  |
Property, Plant and Equipment |  |
Utility | 134 | 125
General and other |  |
Property, Plant and Equipment |  |
Utility | 746 | 706
Work in process |  |
Property, Plant and Equipment |  |
Utility | 130 | 94
Non-utility | 150 | 258
Land |  |
Property, Plant and Equipment |  |
Non-utility | 202 | 172
Buildings and improvements |  |
Property, Plant and Equipment |  |
Non-utility | $ 445 | 429
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 | $ 242 | 233
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 | $ 4,052 | 3,985
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 | $ 48 | 48
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 | $ 1,710 | 1,598
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 | $ 467 | $ 430
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + 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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