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Summary of Significant Accounting Policies General and Basis of Presentation (Details) $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($) People	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)
Accounting Policies [Abstract]
Population of TVA's service area | People	10
Appropriation-investment power program			$ 1,000
Depreciation expense	$ 466	$ 453

X

- Definition

The population of the company's service area.

+ References

No definition available.

+ Details

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X

- Definition

The remaining appropriation investment if no additional appropriations from Congress are received.

+ References

No definition available.

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- References

No definition available.

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- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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