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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.”