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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, 2019	Sep. 30, 2018
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	$ 1,972	$ 1,293
Other Credit Derivatives [Member] | Other long-term liabilities
Derivatives, Fair Value
Fair value	12	72
Other Credit Derivatives [Member] | Other current assets
Derivatives, Fair Value
Fair value	1,676	1,122
200 million Sterling currency swap
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	208	94	[1]
Fair value	(90)	(67)
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(84)	(62)
200 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(6)	(5)
250 million Sterling currency swap
Derivatives, Fair Value
Fair value	(61)	(12)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(56)	(7)
250 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(5)	(5)
150 million Sterling currency swap
Derivatives, Fair Value
Fair value	(57)	(15)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(53)	(12)
150 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(4)	(3)
$1.0 billion notional interest rate swap
Derivatives, Fair Value
Fair value	(1,261)	(878)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(1,199)	(822)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(62)	(56)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(498)	(317)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(474)	(297)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(24)	(20)
$42 million notional interest rate swap
Derivatives, Fair Value
Fair value	(5)	(4)
$42 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(3)	(3)
$42 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(2)	(1)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	(41)	60
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	12	41
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(16)	(8)
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	0	31
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	$ (37)	$ (4)
[1] Letters of credit of approximately $1.3 billion and $921 million were posted as collateral at September 30, 2019 and 2018, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives.

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