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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020
Derivatives, Fair Value
Forward Contract Derivative Asset, at Fair Value	$ 2	$ 13
Gross amounts of recognized liabilities	1,717	2,250
$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
Fair value	0	(78)
Gross amounts of recognized liabilities	51	209
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	(17)	(63)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(13)	(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	(34)	(68)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(31)	(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	(1,200)	(1,449)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(1,119)	(1,369)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(64)	(43)
$1.0 billion notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(17)	(37)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(464)	(588)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(433)	(556)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(30)	(22)
$476 million notional interest rate swap | Interest payable, current
Derivatives, Fair Value
Fair value	(1)	(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	106	46
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	20	23
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	90	26
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(3)
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(1)	(3)
Fair Value, Inputs, Level 2
Derivatives, Fair Value
Forward Contract Derivative Asset, at Fair Value	$ 2	$ 13

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