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Fair Value Measurements Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Investments |  |  |  |
Interest rate swaps | $ 1,258 |  | $ 1,723 |
Fair Value, Inputs, Level 1 |  |  |  |
Investments |  |  |  |
Commodity contract derivatives | 0 |  | 0 |
Swap contracts | 0 |  | 0 |
Currency swaps | 0 |  | 0 |
Interest rate swaps | 0 |  | 0 |
Total | 0 |  | 0 |
Fair Value, Inputs, Level 2 |  |  |  |
Investments |  |  |  |
Commodity contract derivatives | 2 |  | 0 |
Swap contracts | 293 |  | 351 |
Currency swaps | 56 |  | 54 |
Interest rate swaps | 1,258 |  | 1,723 |
Total | 1,609 |  | 2,128 |
Fair Value, Inputs, Level 3 |  |  |  |
Investments |  |  |  |
Commodity contract derivatives | 117 |  | 386 |
Swap contracts | 0 |  | 0 |
Currency swaps | 0 |  | 0 |
Interest rate swaps | 0 |  | 0 |
Total | 117 |  | 386 |
Netting |  |  |  |
Investments |  |  |  |
Commodity contract derivatives | 0 | [1] | 0 | [1]
Swap contracts | (110) | [1] | (115) | [1]
Currency swaps | 0 | [1] | 0 | [1]
Interest rate swaps | 0 | [1] | 0 | [1]
Total | (110) | [1] | (115) | [1]
Liabilities, Total |  |  |  |
Investments |  |  |  |
Commodity contract derivatives | 119 |  | 386 |
Swap contracts | 183 |  | 236 |
Currency swaps | 56 |  | 54 |
Interest rate swaps | 1,258 |  | 1,723 |
Total | 1,616 |  | 2,399 |
Fair Value, Inputs, Level 1 |  |  |  |
Investments |  |  |  |
Equity securities | 136 |  | 173 |
U.S. government corporations and agencies | 43 |  | 59 |
Corporate debt securities | 0 |  | 0 |
Residential mortgage-backed securities | 0 |  | 0 |
Commercial mortgage-backed securities | 0 |  | 0 |
Collateralized debt obligations | 0 |  | 0 |
Private partnerships | 0 |  | 0 |
Equity security commingled funds | 0 | [2] | 0 | [2]
Debt security commingled funds | 0 | [2] | 0 | [2]
Total investments | 179 |  | 232 |
Currency swaps | 0 |  | 0 |
Commodity contract derivatives | 0 |  | 0 |
Swap contracts | 0 |  | 0 |
Total | 179 |  | 232 |
Fair Value, Inputs, Level 2 |  |  |  |
Investments |  |  |  |
Equity securities | 0 |  | 0 |
U.S. government corporations and agencies | 80 |  | 103 |
Corporate debt securities | 143 |  | 197 |
Residential mortgage-backed securities | 13 |  | 20 |
Commercial mortgage-backed securities | 6 |  | 6 |
Collateralized debt obligations | 22 |  | 12 |
Private partnerships | 0 |  | 0 |
Equity security commingled funds | 714 | [2] | 657 | [2]
Debt security commingled funds | 263 | [2] | 182 | [2]
Total investments | 1,241 |  | 1,177 |
Currency swaps | 16 |  | 21 |
Commodity contract derivatives | 0 |  | 0 |
Swap contracts | 112 |  | 123 |
Total | 1,369 |  | 1,321 |
Fair Value, Inputs, Level 3 |  |  |  |
Investments |  |  |  |
Equity securities | 0 |  | 0 |
U.S. government corporations and agencies | 0 |  | 0 |
Corporate debt securities | 0 |  | 0 |
Residential mortgage-backed securities | 0 |  | 0 |
Commercial mortgage-backed securities | 0 |  | 0 |
Collateralized debt obligations | 0 |  | 0 |
Private partnerships | 150 |  | 53 |
Equity security commingled funds | 0 | [2] | 0 | [2]
Debt security commingled funds | 0 | [2] | 0 | [2]
Total investments | 150 |  | 53 |
Currency swaps | 0 |  | 0 |
Commodity contract derivatives | 8 |  | 119 |
Swap contracts | 0 |  | 0 |
Total | 158 |  | 172 |
Netting |  |  |  |
Investments |  |  |  |
Equity securities | 0 | [1] | 0 | [1]
U.S. government corporations and agencies | 0 | [1] | 0 | [1]
Corporate debt securities | 0 | [1] | 0 | [1]
Residential mortgage-backed securities | 0 | [1] | 0 | [1]
Commercial mortgage-backed securities | 0 | [1] | 0 | [1]
Collateralized debt obligations | 0 | [1] | 0 | [1]
Private partnerships | 0 | [1] | 0 | [1]
Equity security commingled funds | 0 | [1],[2] | 0 | [1],[2]
Debt security commingled funds | 0 | [1],[2] | 0 | [1],[2]
Total investments | 0 | [1] | 0 | [1]
Currency swaps | 0 | [1] | 0 | [1]
Commodity contract derivatives | 0 | [1] | 0 | [1]
Swap contracts | (110) | [1] | (115) | [1]
Total | (110) | [1] | (115) | [1]
Assets, Total |  |  |  |
Investments |  |  |  |
Equity securities | 136 |  | 173 |
U.S. government corporations and agencies | 123 |  | 162 |
Corporate debt securities | 143 |  | 197 |
Residential mortgage-backed securities | 13 |  | 20 |
Commercial mortgage-backed securities | 6 |  | 6 |
Collateralized debt obligations | 22 |  | 12 |
Private partnerships | 150 |  | 53 |
Equity security commingled funds | 714 | [2] | 657 | [2]
Debt security commingled funds | 263 | [2] | 182 | [2]
Total investments | 1,570 |  | 1,462 |
Currency swaps | 16 |  | 21 |
Commodity contract derivatives | 8 |  | 119 |
Swap contracts | 2 |  | 8 |
Total | $ 1,596 |  | $ 1,610 |
[1] | Due to the right of setoff and method of settlement, TVA elects to record commodity derivatives under the FTP based on its net commodity position with the counterparty or broker.
[2] | Commingled funds represent investment funds comprising multiple individual financial instruments and are classified in the table based on their existing investment portfolio as of the measurement date. Commingled funds exclusively composed of one class of security are classified in that category. Commingled funds comprising multiple classes of securities are classified as “other commingled funds.”

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- Definition Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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