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Fair Value Measurements Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financing Receivable, after Allowance for Credit Loss |  | $ 96 | $ 93 |
Investments |  |  |  |
Equity securities |  | 588 | 500 |
Government debt securities |  | 529 | 525 |
Corporate debt securities |  | 400 | 356 |
Mortgage and asset-backed securities |  | 27 | 27 |
Institutional mutual funds |  | 214 | 188 |
Forward debt securities contracts |  | 11 | 13 |
Private credit measured at net asset value |  | 56 | 53 |
Private equity funds measured at net asset value(1) |  | 238 | 194 | [1]
Private real estate funds measured at net asset value(1) |  | 190 | 168 | [1]
Commingled funds measured at net asset value(1) |  | 1,334 | 1,174 | [1]
Total investments |  | 3,587 | 3,198 |
Commodity contract derivatives |  | 25 | 49 |
Total |  | 3,612 | 3,247 |
Liabilities |  |  |  |
Currency swaps | [2] | 108 | 209 |
Interest rate swaps |  | 1,869 | 2,041 |
Commodity contract derivatives |  | 3 | 3 |
Total |  | 1,980 | 2,253 |
Decommissioning Fund Investments |  | 971 |  |
Balance in NDT |  | 2,500 |  |
Fair Value, Inputs, Level 1 |  |  |  |
Investments |  |  |  |
Equity securities |  | 588 | 500 |
Government debt securities |  | 500 | 485 |
Corporate debt securities |  | 0 | 0 |
Mortgage and asset-backed securities |  | 0 | 0 |
Institutional mutual funds |  | 214 | 188 |
Forward debt securities contracts |  | 0 | 0 |
Private credit measured at net asset value |  | 0 | 0 |
Private equity funds measured at net asset value(1) | [1] |  | 0 |
Private real estate funds measured at net asset value(1) |  | 0 | 0 | [1]
Commingled funds measured at net asset value(1) |  | 0 | 0 | [1]
Total investments |  | 1,302 | 1,173 |
Commodity contract derivatives |  | 0 | 0 |
Total |  | 1,302 | 1,173 |
Liabilities |  |  |  |
Currency swaps |  | 0 | 0 | [2]
Interest rate swaps |  | 0 | 0 |
Commodity contract derivatives |  | 0 | 0 |
Total |  | 0 | 0 |
Fair Value, Inputs, Level 2 |  |  |  |
Investments |  |  |  |
Equity securities |  | 0 | 0 |
Government debt securities |  | 29 | 40 |
Corporate debt securities |  | 400 | 356 |
Mortgage and asset-backed securities |  | 27 | 27 |
Institutional mutual funds |  | 0 | 0 |
Forward debt securities contracts |  | 11 | 13 |
Private credit measured at net asset value |  | 0 | 0 |
Private equity funds measured at net asset value(1) | [1] |  | 0 |
Private real estate funds measured at net asset value(1) |  | 0 | 0 | [1]
Commingled funds measured at net asset value(1) |  | 0 | 0 | [1]
Total investments |  | 467 | 436 |
Commodity contract derivatives |  | 25 | 49 |
Total |  | 492 | 485 |
Liabilities |  |  |  |
Currency swaps |  | 108 | 209 | [2]
Interest rate swaps |  | 1,869 | 2,041 |
Commodity contract derivatives |  | 3 | 3 |
Total |  | 1,980 | 2,253 |
Fair Value, Inputs, Level 3 |  |  |  |
Investments |  |  |  |
Equity securities |  | 0 | 0 |
Government debt securities |  | 0 | 0 |
Corporate debt securities |  | 0 | 0 |
Mortgage and asset-backed securities |  | 0 | 0 |
Institutional mutual funds |  | 0 | 0 |
Forward debt securities contracts |  | 0 | 0 |
Private credit measured at net asset value |  | 0 | 0 |
Private equity funds measured at net asset value(1) | [1] |  | 0 |
Private real estate funds measured at net asset value(1) |  | 0 | 0 | [1]
Commingled funds measured at net asset value(1) |  | 0 | 0 | [1]
Total investments |  | 0 | 0 |
Commodity contract derivatives |  | 0 | 0 |
Total |  | 0 | 0 |
Liabilities |  |  |  |
Currency swaps |  | 0 | 0 | [2]
Interest rate swaps |  | 0 | 0 |
Commodity contract derivatives |  | 0 | 0 |
Total |  | $ 0 | $ 0 |
[1] | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the Consolidated Balance Sheets.
[2] | TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.

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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, residential mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References No definition available. + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning nuclear facilities. + References No definition available. + Details
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- Definition The fair value measurements of private partnerships measured at net asset value. Private partnership investments may include holdings of investments in private real estate, venture capital, buyout, mezzanine or subordinated debt, restructuring or distressed debt, and special situations through funds management by third-party managers. + References No definition available. + Details
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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Fair value of firm holdings in corporate fixed income securities. Includes pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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