XML 172 R86.htm IDEA: XBRL DOCUMENT
v3.20.2

Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Mark-to-Market Values of TVA Derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Gross Liability | $ 2,250 |
Other Credit Derivatives [Member] | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | 49 | $ 12
Other Credit Derivatives [Member] | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 1,927 | 1,676
200 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Gross Liability | 209 |
Fair value | (78) | (90)
200 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | 0 | (84)
200 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (78) | (6)
250 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (63) | (61)
250 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (58) | (56)
250 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (5) | (5)
150 million Sterling currency swap |  |
Derivatives, Fair Value |  |
Fair value | (68) | (57)
150 million Sterling currency swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (65) | (53)
150 million Sterling currency swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (3) | (4)
$1.0 billion notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (1,449) | (1,261)
$1.0 billion notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (1,369) | (1,199)
$1.0 billion notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (80) | (62)
$476 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (588) | (498)
$476 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (556) | (474)
$476 million notional interest rate swap | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | (32) | (24)
$42 million notional interest rate swap |  |
Derivatives, Fair Value |  |
Fair value | (4) | (5)
$42 million notional interest rate swap | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | (2) | (3)
$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 | 46 | (41)
Commodity contract derivatives | Other long-term assets |  |
Derivatives, Fair Value |  |
Fair value | 26 | 0
Commodity contract derivatives | Other long-term liabilities |  |
Derivatives, Fair Value |  |
Fair value | 0 | (16)
Commodity contract derivatives | Other current assets |  |
Derivatives, Fair Value |  |
Fair value | 23 | 12
Commodity contract derivatives | Accounts payable and accrued liabilities |  |
Derivatives, Fair Value |  |
Fair value | $ (3) | $ (37)

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_OtherCreditDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tve_A250MillionSterlingCurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tve_A150MillionSterlingCurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tve_A10BillionNotionalInterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tve_A42MillionNotionalInterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |