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Leases Amounts Recognized on TVA's Consolidated Statements of Cash Flows (Details) $ in Millions	3 Months Ended
	Dec. 31, 2019 USD ($)
Amounts Recognized on TVA's Consolidated Statements of Cash Flows [Abstract]
Operating cash flows for operating leases	$ 14
Operating cash flows for finance leases	6
Financing cash flows for finance leases	1
Lease assets obtained in exchange for lease obligations (non-cash) - Operating	4
Lease assets obtained in exchange for lease obligations (non-cash) - Finance	$ 0