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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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