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Fair Value Measurements Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financing Receivable, Net |  | $ 124 | $ 123 |
Investments |  |  |  |
Equity securities |  | 193 | 220 |
Government debt securities |  | 214 | 236 |
Corporate debt securities |  | 442 | 499 |
Mortgage and asset-backed securities |  | 35 | 50 |
Institutional mutual funds |  | 209 | 126 |
Forward debt securities contracts |  | 43 | 45 |
Private equity funds measured at net asset value(1) |  | 118 | 132 | [1]
Private real estate funds measured at net asset value(1) |  | 126 | 124 | [1]
Commingled funds measured at net asset value(1) |  | 1,195 | 1,430 | [1]
Total investments |  | 2,592 | 2,862 |
Commodity contract derivatives |  | 77 | 72 |
Total |  | 2,669 | 2,934 |
Liabilities |  |  |  |
Currency swaps | [2] | 146 | 94 |
Interest rate swaps |  | 1,280 | 1,199 |
Commodity contract derivatives |  | 10 | 12 |
Total |  | 1,436 | 1,305 |
Fair Value, Inputs, Level 1 |  |  |  |
Investments |  |  |  |
Equity securities |  | 194 | 220 |
Government debt securities |  | 174 | 199 |
Corporate debt securities |  | 0 | 0 |
Mortgage and asset-backed securities |  | 0 | 0 |
Institutional mutual funds |  | 209 | 126 |
Forward debt securities contracts |  | 0 | 0 |
Private equity funds measured at net asset value(1) |  | 0 | 0 | [1]
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 |  | 577 | 545 |
Commodity contract derivatives |  | 0 | 0 |
Total |  | 577 | 545 |
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 |  | 40 | 37 |
Corporate debt securities |  | 442 | 499 |
Mortgage and asset-backed securities |  | 35 | 50 |
Institutional mutual funds |  | 0 | 0 |
Forward debt securities contracts |  | 43 | 45 |
Private equity funds measured at net asset value(1) |  | 0 | 0 | [1]
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 |  | 560 | 631 |
Commodity contract derivatives |  | 14 | 13 |
Total |  | 574 | 644 |
Liabilities |  |  |  |
Currency swaps |  | 146 | 94 | [2]
Interest rate swaps |  | 1,280 | 1,199 |
Commodity contract derivatives |  | 10 | 11 |
Total |  | 1,436 | 1,304 |
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 equity funds measured at net asset value(1) |  | 0 | 0 | [1]
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 |  | 63 | 59 |
Total |  | 63 | 59 |
Liabilities |  |  |  |
Currency swaps |  | 0 | 0 | [2]
Interest rate swaps |  | 0 | 0 |
Commodity contract derivatives |  | 0 | 1 |
Total |  | $ 0 | $ 1 |
[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 in 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 — Offsetting of Derivative Assets and Liabilities.

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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