XML 43 R17.htm IDEA: XBRL DOCUMENT
v3.20.4

Asset Retirement Obligations | 3 Months Ended
--- | ---
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations During the three months ended December 31, 2020, TVA's total asset retirement obligations ("ARO") liability increased $2 million as a result of periodic accretion, partially offset by revisions in estimate and settlement projects that were conducted during the period. The nuclear and non-nuclear accretion amounts were deferred as regulatory assets. During the three months ended December 31, 2020, $18 million of the related regulatory assets were amortized into expense as these amounts were collected in rates. See Note 7 — Regulatory Assets and Liabilities. TVA maintains investment trusts to help fund its decommissioning obligations. See Note 14 — Fair Value Measurements — Investment Funds and Note 19 — Contingencies and Legal Proceedings — Contingencies — Decommissioning Costs for disclosure of the current balances of the trusts and a discussion of the trusts' objectives.
Asset Retirement Obligation Activity |
| Nuclear |  | Non-Nuclear |  | Total |
Balance at September 30, 2020 | $ | 3,278 |  |  | $ | 3,507 |  |  | $ | 6,785 |  | (1)
Settlements | (1) |  |  | (38) |  |  | (39) |  |
Revisions in estimate | 2 |  |  | (12) |  |  | (10) |  |
Accretion (recorded as regulatory asset) | 37 |  |  | 14 |  |  | 51 |  |
Balance at December 31, 2020 | $ | 3,316 |  |  | $ | 3,471 |  |  | $ | 6,787 |  | (1)
Note (1) Includes $345 million at both December 31, 2020, and September 30, 2020, respectively, in Current liabilities.

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
Name: | us-gaap_AssetRetirementObligationDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration