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Net Completed Plant | 12 Months Ended
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Sep. 30, 2020
Property, Plant and Equipment, Net, by Type [Abstract] |
Property, Plant, and Equipment and Intangible Assets | Net Completed Plant Net completed plant consisted of the following:
Net Completed Plant At September 30
| 2020 |  | 2019
| Cost |  | Accumulated Depreciation |  | Net |  | Cost |  | Accumulated Depreciation |  | Net
Coal-fired(1)(2) | $ | 18,613 |  |  | $ | 13,944 |  |  | $ | 4,669 |  |  | $ | 17,400 |  |  | $ | 12,538 |  |  | $ | 4,862 |
Gas and oil-fired | 6,010 |  |  | 1,696 |  |  | 4,314 |  |  | 6,054 |  |  | 1,562 |  |  | 4,492 |
Nuclear | 25,741 |  |  | 12,141 |  |  | 13,600 |  |  | 25,543 |  |  | 11,656 |  |  | 13,887 |
Transmission | 8,283 |  |  | 3,140 |  |  | 5,143 |  |  | 7,932 |  |  | 3,083 |  |  | 4,849 |
Hydroelectric | 3,410 |  |  | 1,090 |  |  | 2,320 |  |  | 3,163 |  |  | 1,051 |  |  | 2,112 |
Other electrical plant | 1,981 |  |  | 1,146 |  |  | 835 |  |  | 1,920 |  |  | 1,110 |  |  | 810 |
Intangible software | 3 |  |  | 2 |  |  | 1 |  |  | 3 |  |  | 1 |  |  | 2 |
Multipurpose dams | 900 |  |  | 381 |  |  | 519 |  |  | 900 |  |  | 373 |  |  | 527 |
Other stewardship | 29 |  |  | 10 |  |  | 19 |  |  | 29 |  |  | 10 |  |  | 19 |
Total | $ | 64,970 |  |  | $ | 33,550 |  |  | $ | 31,420 |  |  | $ | 62,944 |  |  | $ | 31,384 |  |  | $ | 31,560 |
Notes (1) TVA recognized accelerated depreciation as a result of the decision to idle or retire certain units. See Note 6 — Plant Closures. (2) In 2020, TVA recorded approximately $1.1 billion in upward revisions to asset retirement costs for coal-fired assets. See Note 12 — Asset Retirement Obligations.

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- Definition The entire disclosure for intangible assets and long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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