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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, 2021	Sep. 30, 2020
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	$ 1,722
200 million Sterling currency swap
Derivatives, Fair Value
Fair value	0	$ (78)
200 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	0	(78)
250 million Sterling currency swap
Derivatives, Fair Value
Fair value	(36)	(63)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(32)	(58)
250 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(4)	(5)
150 million Sterling currency swap
Derivatives, Fair Value
Fair value	(47)	(68)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(44)	(65)
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	(1,182)	(1,449)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(1,101)	(1,369)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(44)	(43)
$1.0 billion notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(37)	(37)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(455)	(588)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(423)	(556)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(22)	(22)
$476 million notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(10)	(10)
$42 million notional interest rate swap
Derivatives, Fair Value
Fair value	(2)	(4)
$42 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(2)
$42 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(1)	(2)
$42 million notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(1)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	247	46
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	40	23
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	210	26
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(3)	$ (3)
$28 million notional
Derivatives, Fair Value
Derivative, Notional Amount	28
$14 million notional
Derivatives, Fair Value
Derivative, Notional Amount	$ 14

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