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Property, Plant and Equipment - Schedule of Average Composite Depreciation Rates (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment
Depreciation	$ 507	$ 496	$ 476
Regulated natural gas utilities
Property, Plant and Equipment
Average composite depreciation rates (as a percentage)	2.50%	2.60%	2.40%
Electric utility
Property, Plant and Equipment
Average composite depreciation rates (as a percentage)	2.40%	2.50%	2.30%

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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.

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X

- Definition

Composite depreciation rate for public utility plants in service.

+ References

No definition available.

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