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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) - USD ($)
$ in Millions

Dec. 31, 2016

Sep. 30, 2016

Derivatives, Fair Value

Gross amounts of recognized liabilities

$ 1,687

$ 2,145

200 million Sterling currency swap

Derivatives, Fair Value

Gross amounts of recognized liabilities

^[1]

170

162

200 million Sterling currency swap | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(88)

(82)

250 million Sterling currency swap | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(47)

(41)

150 million Sterling currency swap | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(35)

(39)

$1.0 billion notional interest rate swap | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(1,084)

(1,387)

$476 million notional interest rate swap | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(404)

(539)

$42 million notional interest rate swap | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(9)

(12)

Commodity contract derivatives

Derivatives, Fair Value

Fair value

(87)

(125)

Commodity contract derivatives | Other long-term assets

Derivatives, Fair Value

Fair value

6

3

Commodity contract derivatives | Other current assets

Derivatives, Fair Value

Fair value

22

6

Commodity contract derivatives | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

(32)

(49)

Commodity contract derivatives | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(83)

(85)

Commodity derivatives under FTP

Derivatives, Fair Value

Fair value

^[2]

(20)

(39)

Gross amounts of recognized liabilities

20

45

Commodity derivatives under FTP | Other current assets

Derivatives, Fair Value

Fair value

(15)

(30)

Commodity derivatives under FTP | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(5)

(7)

Derivatives in net liability positions | Other current assets

Derivatives, Fair Value

Gross amounts of recognized liabilities

15

30

Derivatives in net liability positions | Other Noncurrent Liabilities

Derivatives, Fair Value

Fair value

$ 0

$ (2)

[1]

Letters of credit of approximately $1.1 billion and $1.4 billion were posted as collateral at December 31, 2016, and September 30, 2016, 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.

[2]

Fair values of certain derivatives under the FTP that were in net liability positions totaling $15 million and $30 million at December 31, 2016, and September 30, 2016, 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.

X

- 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=64830801&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=64837297&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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