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Fair Value Measurements Fair Value Measurements - Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Investments    
Equity securities $ 162 $ 151
Debt securities    
U.S. government corporations and agencies 85 105
Corporate debt securities 290 255
Residential mortgage-backed securities 14 25
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 29 10
Private partnerships 214 159
Commingled funds    
Equity security commingled funds 943 [1] 741 [1]
Debt security commingled funds 237 [1] 248 [1]
Total investments 1,981 1,701
Currency swaps 0 28
Commodity contract derivatives 1 3
Commodity derivatives under FTP    
Swap contracts 0 3
Total commodity derivatives under FTP 0 3
Total 1,982 1,735
Liabilities [Abstract]    
Currency swaps 15 15
Interest rate swaps 1,348 1,199
Commodity contract derivatives 97 144
Commodity derivatives under FTP    
Swap contracts 34 69
Total commodity derivatives under FTP 34 69
Total 1,494 1,427
Fair Value, Inputs, Level 1
    
Investments    
Equity securities 162 151
Debt securities    
U.S. government corporations and agencies 46 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
Commingled funds    
Equity security commingled funds 40 [1] 0 [1]
Debt security commingled funds 61 [1] 0 [1]
Total investments 309 189
Currency swaps 0 0
Commodity contract derivatives 0 0
Commodity derivatives under FTP    
Swap contracts 0 0
Total commodity derivatives under FTP 0 0
Total 309 189
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 39 67
Corporate debt securities 290 255
Residential mortgage-backed securities 14 25
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 29 10
Private partnerships 0 0
Commingled funds    
Equity security commingled funds 903 [1] 741 [1]
Debt security commingled funds 176 [1] 248 [1]
Total investments 1,458 1,353
Currency swaps 0 [2] 28 [2]
Commodity contract derivatives 0 0
Commodity derivatives under FTP    
Swap contracts 0 3
Total commodity derivatives under FTP 0 3
Total 1,458 1,384
Liabilities [Abstract]    
Currency swaps 15 15
Interest rate swaps 1,348 1,199
Commodity contract derivatives 0 1
Commodity derivatives under FTP    
Swap contracts 34 69
Total commodity derivatives under FTP 34 69
Total 1,397 1,284
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 214 159
Commingled funds    
Equity security commingled funds 0 [1] 0 [1]
Debt security commingled funds 0 [1] 0 [1]
Total investments 214 159
Currency swaps 0 0
Commodity contract derivatives 1 3
Commodity derivatives under FTP    
Swap contracts 0 0
Total commodity derivatives under FTP 0 0
Total 215 162
Liabilities [Abstract]    
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 97 143
Commodity derivatives under FTP    
Swap contracts 0 0
Total commodity derivatives under FTP 0 0
Total $ 97 $ 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 15 — Offsetting of Derivative Assets and Liabilities.