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Fair Value Measurements Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Investments    
Equity securities $ 169 $ 151
U.S. government corporations and agencies 117 105
Corporate debt securities 314 255
Residential mortgage-backed securities 25 25
Commercial mortgage-backed securities 3 7
Collateralized debt obligations 8 10
Private partnerships 169 159
Equity security commingled funds 883 [1] 741 [1]
Debt security commingled funds 104 [1] 248 [1]
Total investments 1,792 1,701
Currency swaps 4 28
Commodity contract derivatives 4 3
Swap contracts 1 3
Total 1,801 1,735
Currency swaps 12 15
Interest rate swaps 1,060 1,199
Commodity contract derivatives 150 144
Swap contracts 50 69
Total 1,272 1,427
Fair Value, Inputs, Level 1
    
Investments    
Equity securities 169 151
U.S. government corporations and agencies 53 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 222 189
Currency swaps 0 0
Commodity contract derivatives 0 0
Swap contracts 0 0
Total 222 189
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 64 67
Corporate debt securities 314 255
Residential mortgage-backed securities 25 25
Commercial mortgage-backed securities 3 7
Collateralized debt obligations 8 10
Private partnerships 0 0
Equity security commingled funds 883 [1] 741 [1]
Debt security commingled funds 104 [1] 248 [1]
Total investments 1,401 1,353
Currency swaps 78 61
Commodity contract derivatives 0 0
Swap contracts 70 101
Total 1,549 1,515
Currency swaps 12 15
Interest rate swaps 1,060 1,199
Commodity contract derivatives 1 1
Swap contracts 202 267
Total 1,275 1,482
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 169 159
Equity security commingled funds 0 [1] 0 [1]
Debt security commingled funds 0 [1] 0 [1]
Total investments 169 159
Currency swaps 0 0
Commodity contract derivatives 4 3
Swap contracts 0 0
Total 173 162
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 149 143
Swap contracts 0 0
Total 149 143
Netting
    
Investments    
Equity securities 0 [2] 0 [3]
U.S. government corporations and agencies 0 [2] 0 [3]
Corporate debt securities 0 [2] 0 [3]
Residential mortgage-backed securities 0 [2] 0 [3]
Commercial mortgage-backed securities 0 [2] 0 [3]
Collateralized debt obligations 0 [2] 0 [3]
Private partnerships 0 [2] 0 [3]
Equity security commingled funds 0 [1],[2] 0 [1],[3]
Debt security commingled funds 0 [1],[2] 0 [1],[3]
Total investments 0 [2] 0 [3]
Currency swaps (74) [2] (33) [3]
Commodity contract derivatives 0 [2] 0 [3]
Swap contracts (69) [2] (98) [3]
Total (143) [2] (131) [3]
Currency swaps 0 [2] 0 [3]
Interest rate swaps 0 [2] 0 [3]
Commodity contract derivatives 0 [2] 0 [3]
Swap contracts (152) [2] (198) [3]
Total $ (152) [2] $ (198) [3]
[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.
[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.
[3] 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.