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v3.25.3

Property, Plant and Equipment (Tables) | 12 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
Schedule of Property, Plant and Equipment | Property, plant and equipment comprise the following at September 30:
| 2025 |  | 2024 |  | Estimated Useful Life
Utility: |  |  |  |  |
Distribution | $ | 6,024 |  |  | $ | 5,595 |  |  |
Transmission | 134 |  |  | 125 |  |  |
General and other | 746 |  |  | 706 |  |  |
Work in process | 130 |  |  | 94 |  |  |
Total utility | 7,034 |  |  | 6,520 |  |  |
Non-utility: |  |  |  |  |
Land | 202 |  |  | 172 |  |  |
Buildings and improvements | 445 |  |  | 429 |  |  | 10 - 40 years
Transportation equipment | 242 |  |  | 233 |  |  | 3 - 10 years
Equipment, primarily cylinders and tanks | 4,052 |  |  | 3,985 |  |  | 5 - 30 years
Electric generation | 48 |  |  | 48 |  |  | 25 - 40 years
Pipeline and related assets | 1,710 |  |  | 1,598 |  |  | 25 - 40 years
Other | 467 |  |  | 430 |  |  | 1 - 12 years
Work in process | 150 |  |  | 258 |  |  |
Total non-utility | 7,316 |  |  | 7,153 |  |  |
Total property, plant and equipment | $ | 14,350 |  |  | $ | 13,673 |  |  |
Schedule of Average Composite Depreciation Rates | The average composite depreciation rates at our Gas Utility and Electric Utility were as follows:
| 2025 |  | 2024 |  | 2023
Regulated natural gas utilities | 2.5 | % |  | 2.6 | % |  | 2.4 | %
Electric utility | 2.4 | % |  | 2.5 | % |  | 2.3 | %

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + 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 Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481834/980-20-45-1 + Details
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