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Risk Management Activities and Derivative Transactions Mark-to-Market Values of TVA Derivatives (Details) (USD $)
In Millions, unless otherwise specified

Jun. 30, 2014

Sep. 30, 2013

Derivatives, Fair Value

Gross amounts of recognized liabilities

$ 1,437

$ 1,481

200 million Sterling currency swap | Other long-term liabilities

Derivatives, Fair Value

(2)

(15)

250 million Sterling currency swap | Other long-term assets

Derivatives, Fair Value

64

51

150 million Sterling currency swap | Other long-term assets

Derivatives, Fair Value

7

10

$1.0 billion notional interest rate swap | Other long-term liabilities

Derivatives, Fair Value

(946)

(886)

$476 million notional interest rate swap | Other long-term liabilities

Derivatives, Fair Value

(331)

(300)

$42 million notional interest rate swap | Other long-term liabilities

Derivatives, Fair Value

(12)

(13)

Commodity contract derivatives

Derivatives, Fair Value

(150)

(141)

Commodity contract derivatives | Other long-term assets

Derivatives, Fair Value

2

1

Commodity contract derivatives | Other current assets

Derivatives, Fair Value

3

2

Commodity contract derivatives | Other long-term liabilities

Derivatives, Fair Value

(54)

(35)

Commodity contract derivatives | Accounts Payable and Accrued Liabilities [Member]

Derivatives, Fair Value

(101)

(109)

Commodity derivatives under FTP

Derivatives, Fair Value

(90)

^[1]

(166)

^[1]

Commodity derivatives under FTP | Other current assets

Derivatives, Fair Value

Gross amounts of recognized liabilities

57

100

(56)

(97)

Commodity derivatives under FTP | Other long-term liabilities

Derivatives, Fair Value

(18)

(36)

Commodity derivatives under FTP | Accounts Payable and Accrued Liabilities [Member]

Derivatives, Fair Value

$ (16)

$ (33)

[1]

Fair values of certain derivatives under the FTP that were in net liability positions totaling $57 million and $100 million at June 30, 2014 and September 30, 2013, 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.