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

Jun. 30, 2018

Sep. 30, 2017

Derivatives, Fair Value

Gross amounts of recognized liabilities

$ 1,339

$ 1,619

200 million Sterling currency swap

Derivatives, Fair Value

Fair value

(63)

(67)

Gross amounts of recognized liabilities

^[1]

85

103

200 million Sterling currency swap | Other long-term liabilities

Derivatives, Fair Value

Fair value

(58)

(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

(7)

(15)

250 million Sterling currency swap | Other long-term liabilities

Derivatives, Fair Value

Fair value

(3)

(11)

250 million Sterling currency swap | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(4)

(4)

150 million Sterling currency swap

Derivatives, Fair Value

Fair value

(15)

(21)

150 million Sterling currency swap | Other long-term liabilities

Derivatives, Fair Value

Fair value

(12)

(19)

150 million Sterling currency swap | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(3)

(2)

$1.0 billion notional interest rate swap

Derivatives, Fair Value

Fair value

(914)

(1,093)

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

Derivatives, Fair Value

Fair value

(858)

(1,027)

$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(56)

(66)

$476 million notional interest rate swap

Derivatives, Fair Value

Fair value

(334)

(410)

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

Derivatives, Fair Value

Fair value

(314)

(385)

$476 million notional interest rate swap | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(20)

(25)

$42 million notional interest rate swap

Derivatives, Fair Value

Fair value

(6)

(8)

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

Derivatives, Fair Value

Fair value

(4)

(6)

$42 million notional interest rate swap | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(2)

(2)

Commodity contract derivatives

Derivatives, Fair Value

Fair value

(4)

(60)

Commodity contract derivatives | Other long-term assets

Derivatives, Fair Value

Fair value

6

2

Commodity contract derivatives | Other current assets

Derivatives, Fair Value

Fair value

21

8

Commodity contract derivatives | Other long-term liabilities

Derivatives, Fair Value

Fair value

(14)

(9)

Commodity contract derivatives | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

(17)

(61)

Commodity derivatives under FTP

Derivatives, Fair Value

Fair value

^[2]

0

(5)

Gross amounts of recognized liabilities

5

Derivatives in net liability positions | Other current assets

Derivatives, Fair Value

Fair value

$ 0

(4)

Gross amounts of recognized liabilities

4

Derivatives in net liability positions | Accounts payable and accrued liabilities

Derivatives, Fair Value

Fair value

$ (1)

[1]

Letters of credit of approximately $0.9 billion and $1.2 billion were posted as collateral at June 30, 2018, and September 30, 2017, 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 $4 million at September 30, 2017, were recorded in TVA's margin cash accounts in Other current assets. These derivatives were transacted with futures commission merchants, and cash deposits were posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full. At June 30, 2018, TVA had no derivatives under the FTP in net liability positions.