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Fair Value Measurements Fair Value Measurements - Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Investments |  |  |  |
Equity securities | $ 151 |  | $ 173 |
Debt securities |  |  |  |
U.S. government corporations and agencies | 105 |  | 162 |
Corporate debt securities | 255 |  | 197 |
Residential mortgage-backed securities | 25 |  | 20 |
Commercial mortgage-backed securities | 7 |  | 6 |
Collateralized debt obligations | 10 |  | 12 |
Private partnerships | 159 |  | 53 |
Commingled funds |  |  |  |
Equity security commingled funds | 741 | [1] | 657 | [1]
Debt security commingled funds | 248 | [1] | 182 | [1]
Total investments | 1,701 |  | 1,462 |
Currency swaps | 61 |  | 21 |
Commodity contact derivatives | 3 |  | 119 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 4 |  | 8 |
Total commodity derivatives under FTP | 4 |  | 8 |
Total | 1,769 |  | 1,610 |
Liabilities [Abstract] |  |  |  |
Currency swaps | 15 |  | 54 |
Interest rate swaps | 1,199 |  | 1,723 |
Commodity contract derivatives | 144 |  | 386 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 170 |  | 236 |
Total commodity derivatives under FTP | 170 |  | 236 |
Total | 1,528 |  | 2,399 |
Fair Value, Inputs, Level 1 |  |  |  |
Investments |  |  |  |
Equity securities | 151 |  | 173 |
Debt securities |  |  |  |
U.S. government corporations and agencies | 38 |  | 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 |
Commingled funds |  |  |  |
Equity security commingled funds | 0 | [1] | 0 | [1]
Debt security commingled funds | 0 | [1] | 0 | [1]
Total investments | 189 |  | 232 |
Currency swaps | 0 |  | 0 |
Commodity contact derivatives | 0 |  | 0 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 0 |  | 0 |
Total commodity derivatives under FTP | 0 |  | 0 |
Total | 189 |  | 232 |
Liabilities [Abstract] |  |  |  |
Currency swaps | 0 |  | 0 |
Interest rate swaps | 0 |  | 0 |
Commodity contract derivatives | 0 |  | 0 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 0 |  | 0 |
Total commodity derivatives under FTP | 0 |  | 0 |
Total | 0 |  | 0 |
Fair Value, Inputs, Level 2 |  |  |  |
Investments |  |  |  |
Equity securities | 0 |  | 0 |
Debt securities |  |  |  |
U.S. government corporations and agencies | 67 |  | 103 |
Corporate debt securities | 255 |  | 197 |
Residential mortgage-backed securities | 25 |  | 20 |
Commercial mortgage-backed securities | 7 |  | 6 |
Collateralized debt obligations | 10 |  | 12 |
Private partnerships | 0 |  | 0 |
Commingled funds |  |  |  |
Equity security commingled funds | 741 | [1] | 657 | [1]
Debt security commingled funds | 248 | [1] | 182 | [1]
Total investments | 1,353 |  | 1,177 |
Currency swaps | 61 |  | 21 |
Commodity contact derivatives | 0 |  | 0 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 101 |  | 123 |
Total commodity derivatives under FTP | 101 |  | 123 |
Total | 1,515 |  | 1,321 |
Liabilities [Abstract] |  |  |  |
Currency swaps | 15 |  | 54 |
Interest rate swaps | 1,199 |  | 1,723 |
Commodity contract derivatives | 1 |  | 0 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 267 |  | 351 |
Total commodity derivatives under FTP | 267 |  | 351 |
Total | 1,482 |  | 2,128 |
Fair Value, Inputs, Level 3 |  |  |  |
Investments |  |  |  |
Equity securities | 0 |  | 0 |
Debt securities |  |  |  |
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 | 159 |  | 53 |
Commingled funds |  |  |  |
Equity security commingled funds | 0 | [1] | 0 | [1]
Debt security commingled funds | 0 | [1] | 0 | [1]
Total investments | 159 |  | 53 |
Currency swaps | 0 |  | 0 |
Commodity contact derivatives | 3 |  | 119 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 0 |  | 0 |
Total commodity derivatives under FTP | 0 |  | 0 |
Total | 162 |  | 172 |
Liabilities [Abstract] |  |  |  |
Currency swaps | 0 |  | 0 |
Interest rate swaps | 0 |  | 0 |
Commodity contract derivatives | 143 |  | 386 |
Commodity derivatives under FTP |  |  |  |
Swap contracts | 0 |  | 0 |
Total commodity derivatives under FTP | 0 |  | 0 |
Total | 143 |  | 386 |
Netting |  |  |  |
Investments |  |  |  |
Equity securities | 0 | [2] | 0 | [2]
Debt securities |  |  |  |
U.S. government corporations and agencies | 0 | [2] | 0 | [2]
Corporate debt securities | 0 | [2] | 0 | [2]
Residential mortgage-backed securities | 0 | [2] | 0 | [2]
Commercial mortgage-backed securities | 0 | [2] | 0 | [2]
Collateralized debt obligations | 0 | [2] | 0 | [2]
Private partnerships | 0 | [2] | 0 | [2]
Commingled funds |  |  |  |
Equity security commingled funds | 0 | [1],[2] | 0 | [1],[2]
Debt security commingled funds | 0 | [1],[2] | 0 | [1],[2]
Total investments | 0 | [2] | 0 | [2]
Currency swaps | 0 | [2] | 0 | [2]
Commodity contact derivatives | 0 | [2] | 0 | [2]
Commodity derivatives under FTP |  |  |  |
Swap contracts | (97) | [2] | (115) | [2]
Total commodity derivatives under FTP | (97) |  | (115) | [2]
Total | (97) | [2] | (115) | [2]
Liabilities [Abstract] |  |  |  |
Currency swaps | 0 | [2] | 0 | [2]
Interest rate swaps | 0 | [2] | 0 | [2]
Commodity contract derivatives | 0 | [2] | 0 | [2]
Commodity derivatives under FTP |  |  |  |
Swap contracts | (97) | [2] | (115) | [2]
Total commodity derivatives under FTP | (97) | [2] | (115) | [2]
Total | $ (97) | [2] | $ (115) | [2]
[1] | 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 primarily composed of one class of security are classified in that category.
[2] | 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.

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