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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021
Derivatives, Fair Value
Derivative, Notional Amount	$ 1,500
Forward Contract Derivative Asset, at Fair Value	2	$ 2
Gross amounts of recognized liabilities	1,468	1,725
$14 million notional [Member]
Derivatives, Fair Value
Derivative, Notional Amount	14
$28 million notional [Member]
Derivatives, Fair Value
Derivative, Notional Amount	28
200 million Sterling currency swap
Derivatives, Fair Value
Gross amounts of recognized liabilities	93	83
250 million Sterling currency swap
Derivatives, Fair Value
Fair value	(43)	(36)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(38)	(32)
250 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(5)	(4)
150 million Sterling currency swap
Derivatives, Fair Value
Fair value	(50)	(47)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(47)	(44)
150 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(3)	(3)
$1.0 billion notional interest rate swap
Derivatives, Fair Value
Fair value	(994)	(1,182)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(924)	(1,101)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(32)	(44)
$1.0 billion notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(38)	(37)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(373)	(455)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(349)	(423)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(15)	(22)
$476 million notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(9)	(10)
$42 million notional interest rate swap
Derivatives, Fair Value
Fair value	(1)	(2)
$42 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value		(1)
$42 million notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(1)	(1)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	202	247
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	31	40
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	207	210
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(4)
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(3)	(3)
Commodity Contract under FHP
Derivatives, Fair Value
Fair value	52	0
Commodity Contract under FHP | Other long-term assets
Derivatives, Fair Value
Fair value	22
Commodity Contract under FHP | Other current assets
Derivatives, Fair Value
Fair value	29
Commodity Contract under FHP | Accounts Receivable [Member]
Derivatives, Fair Value
Fair value	1
Commodity Contract not under FHP | Other current assets
Derivatives, Fair Value
Fair value	178
Fair Value, Inputs, Level 2
Derivatives, Fair Value
Forward Contract Derivative Asset, at Fair Value	2	$ 2
Fair Value, Inputs, Level 2 | Commodity Contract under FHP
Derivatives, Fair Value
Fair value	$ 52

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