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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Derivatives, Fair Value
Gross amounts of recognized liabilities	$ 1,531	$ 1,293
200 million Sterling currency swap
Derivatives, Fair Value
Fair value	(72)	(67)
Gross amounts of recognized liabilities	123	94	[1]
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(67)	(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	(25)	(12)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(20)	(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	(26)	(15)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(23)	(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	(1,020)	(878)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(964)	(822)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(56)	(56)
$476 million notional interest rate swap
Derivatives, Fair Value
Fair value	(383)	(317)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(363)	(297)
$476 million notional interest rate swap | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(20)	(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	28	60
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	10	31
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	32	41
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(7)	(8)
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	$ (7)	$ (4)
[1] Letters of credit of approximately $932 million and $921 million were posted as collateral at March 31, 2019, 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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+ References

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

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