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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, 2018	Sep. 30, 2017
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	$ 1,293	$ 1,619
Other Credit Derivatives [Member] | Other long-term liabilities
Derivatives, Fair Value
Fair value		0
Other Credit Derivatives [Member] | Other current assets
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	0	4
Fair value		(4)
Other Credit Derivatives [Member] | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value		(1)
200 million Sterling currency swap
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability	94	103	[1]
Fair value	(67)	(67)
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(62)	(62)
200 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(5)	(5)
250 million Sterling currency swap
Derivatives, Fair Value
Fair value	(12)	(15)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(7)	(11)
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	(15)	(21)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(12)	(19)
150 million Sterling currency swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(3)	(2)
$1.0 billion notional interest rate swap
Derivatives, Fair Value
Fair value	(878)	(1,093)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(822)	(1,027)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(56)	(66)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(317)	(410)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(297)	(385)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(20)	(25)
$42 million notional interest rate swap
Derivatives, Fair Value
Fair value	(4)	(8)
$42 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(3)	(6)
$42 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(1)	(2)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	60	(60)
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	41	2
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(8)	(9)
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	31	8
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(4)	(61)
Other Contract
Derivatives, Fair Value
Derivative Liability, Fair Value, Gross Liability		5
Fair value	$ 0	$ (5)
[1] Letters of credit of approximately $921 million and $1.2 billion were posted as collateral at September 30, 2018 and 2017, 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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