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Fair Value Measurements Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Investments    
Equity securities $ 177 $ 151
U.S. government corporations and agencies 100 105
Corporate debt securities 313 255
Residential mortgage-backed securities 13 25
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 26 10
Private partnerships 188 159
Equity security commingled funds 931 [1] 741 [1]
Debt security commingled funds 147 [1] 248 [1]
Total investments 1,902 1,701
Currency swaps 15 28
Commodity contract derivatives 5 3
Swap contracts 1 3
Total 1,923 1,735
Currency swaps 2 15
Interest rate swaps 1,289 1,199
Commodity contract derivatives 155 144
Swap contracts 34 69
Total 1,480 1,427
Fair Value, Inputs, Level 1
    
Investments    
Equity securities 177 151
U.S. government corporations and agencies 58 38
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 [1] 0 [1]
Debt security commingled funds 0 [1] 0 [1]
Total investments 235 189
Currency swaps 0 0
Commodity contract derivatives 0 0
Swap contracts 0 0
Total 235 189
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Swap contracts 0 0
Total 0 0
Fair Value, Inputs, Level 2
    
Investments    
Equity securities 0 0
U.S. government corporations and agencies 42 67
Corporate debt securities 313 255
Residential mortgage-backed securities 13 25
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 26 10
Private partnerships 0 0
Equity security commingled funds 931 [1] 741 [1]
Debt security commingled funds 147 [1] 248 [1]
Total investments 1,479 1,353
Currency swaps 15 [2] 28 [2]
Commodity contract derivatives 0 0
Swap contracts 1 [2] 3 [2]
Total 1,495 1,384
Currency swaps 2 15
Interest rate swaps 1,289 1,199
Commodity contract derivatives 4 1
Swap contracts 34 [2] 69 [2]
Total 1,329 1,284
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 188 159
Equity security commingled funds 0 [1] 0 [1]
Debt security commingled funds 0 [1] 0 [1]
Total investments 188 159
Currency swaps 0 0
Commodity contract derivatives 5 3
Swap contracts 0 0
Total 193 162
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 151 143
Swap contracts 0 0
Total $ 151 $ 143
[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 FCM. Deposits are made to TVA's margin cash accounts held with each FCM to offset any net liability positions in full for derivatives that are transacted with FCMs. TVA records currency swaps net of cash collateral received from or paid to the counterparty. See Note 14 — Offsetting of Derivative Assets and Liabilities.