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Summary of Significant Accounting Policies General and Basis of Presentation (Details) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($) People	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) People	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Reclassification of Amounts on Cash Flow and Statement of Operations [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 500		$ 500		$ 500
Restricted Cash and Cash Equivalents	19		19		21
Regulatory Assets	9,385		9,385		10,375
Appropriation-investment power program					1,000
Financing Receivable, after Allowance for Credit Loss	$ 107		$ 107		93
Population of TVA's service area | People	10		10
Allowance for uncollectible accounts	$ 1		$ 1
Depreciation expense	346	$ 407	691	$ 946
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 519	$ 858	$ 519	858	$ 521	$ 322
Cash and Cash Equivalents, Period Increase (Decrease)				$ 536

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