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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Mark-to-Market Values of TVA Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	$ 53
Derivative, Notional Amount	1,500
Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	12	$ 7
250 million Sterling currency swap
Derivatives, Fair Value
Fair value	(130)	(36)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(123)	(32)
250 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(7)	(4)
150 million Sterling currency swap
Derivatives, Fair Value
Fair value	(110)	(47)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(105)	(44)
150 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(5)	(3)
$1.0 billion notional interest rate swap
Derivatives, Fair Value
Fair value	(672)	(1,182)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(630)	(1,101)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(9)	(44)
$1.0 billion notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(33)	(37)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(233)	(455)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(221)	(423)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(3)	(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	0	(2)
$42 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value		(1)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	145	247
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value		40
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	172	210
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value		(3)
$28 million notional
Derivatives, Fair Value
Derivative, Notional Amount	28
$14 million notional
Derivatives, Fair Value
Derivative, Notional Amount	14
Commodity Contract under FHP
Derivatives, Fair Value
Fair value	115	$ 0
Commodity Contract under FHP | Other long-term assets
Derivatives, Fair Value
Fair value	68
Commodity Contract under FHP | Other current assets
Derivatives, Fair Value
Fair value	54
Commodity Contract under FHP | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(8)
Commodity Contract under FHP | Accounts Receivable [Member]
Derivatives, Fair Value
Fair value	1
Commodity Contract not under FHP | Other long-term assets
Derivatives, Fair Value
Fair value	34
Commodity Contract not under FHP | Other long-term liabilities
Derivatives, Fair Value
Fair value	(1)
Commodity Contract not under FHP | Other current assets
Derivatives, Fair Value
Fair value	118
Commodity Contract not under FHP | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	$ (6)

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