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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($) $ in Millions		Mar. 31, 2016	Sep. 30, 2015
Derivatives, Fair Value
Gross amounts of recognized liabilities		$ 1,992	$ 1,839
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(55)	(41)
250 million Sterling currency swap | Other long-term assets
Derivatives, Fair Value
Fair value			25
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(2)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(20)	(6)
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(1,294)	(1,177)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(494)	(438)
$42 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value		(12)	(12)
Commodity contract derivatives
Derivatives, Fair Value
Fair value		(194)	(97)
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value		1	1
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value		3
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value		(76)	(17)
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value		(122)	(81)
Commodity derivatives under FTP
Derivatives, Fair Value
Fair value	[1]	(87)	(116)
Commodity derivatives under FTP | Other current assets
Derivatives, Fair Value
Gross amounts of recognized liabilities		69	89
Fair value		(69)	(89)
Commodity derivatives under FTP | Other long-term liabilities
Derivatives, Fair Value
Fair value		(7)	(10)
Commodity derivatives under FTP | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value		$ (11)	$ (17)
[1] Fair values of certain derivatives under the FTP that were in net liability positions totaling $69 million and $89 million at March 31, 2016 and September 30, 2015, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full.

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