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Commitments and Contingencies (Tables)	12 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Unfunded loan commitments	At September 30, 2021, TVA's commitments under unfunded loan commitments were $4 million for 2022. TVA has no commitments under unfunded loan commitments for 2023 through 2026.

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Unfunded loan commitments [Table Text Block]

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