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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
Derivatives, Fair Value
Gross amounts of recognized liabilities	$ 1,426	$ 1,293
200 million Sterling currency swap
Derivatives, Fair Value
Fair value	(76)	(67)
Gross amounts of recognized liabilities	146	94	[1]
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(70)	(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	(37)	(12)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(32)	(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	(33)	(15)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(30)	(12)
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	(932)	(878)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(877)	(822)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(55)	(56)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(343)	(317)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(324)	(297)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(19)	(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	(4)	(3)
$42 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(1)	(1)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	67	60
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	27	31
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	50	41
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(5)	(8)
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	$ (5)	$ (4)
[1] Letters of credit of approximately $854 million and $921 million were posted as collateral at December 31, 2018, and September 30, 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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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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