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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Sep. 30, 2015
Investments    
Equity securities $ 189 $ 166
Debt Instruments    
U.S. government corporations and agencies 116 234
Corporate debt securities 341 225
Residential mortgage-backed securities 13 17
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 32 29
Institutional mutual funds 83 91
Forward debt securities contracts 14 (59)
Private partnerships measured at net asset value 246 [1] 240 [2]
Commingled funds measured at net asset value 1,084 [1] 1,061 [2]
Total investments 2,125 2,011
Currency swap(s) 0 [3] 25 [4]
Commodity contract derivatives 12 1
Commodity derivatives under FTP    
Swap contracts 0 [3] 0 [4]
Total 2,137 2,037
Liabilities    
Currency swap(s) 167 [3] 47 [4]
Interest rate swaps 1,912 1,627
Commodity contract derivatives 189 98
Commodity derivatives under FTP    
Swap contracts 11 [3] 27 [4]
Total 2,279 1,799
Fair Value, Inputs, Level 1    
Investments    
Equity securities 189 166
Debt Instruments    
U.S. government corporations and agencies 83 203
Corporate debt securities 0 0
Residential mortgage-backed securities 0 0
Commercial mortgage-backed securities 0 0
Collateralized debt obligations 0 0
Institutional mutual funds 83 91
Forward debt securities contracts 0 0
Private partnerships measured at net asset value 0 [1] 0 [2]
Commingled funds measured at net asset value 0 [1] 0 [2]
Total investments 355 460
Currency swap(s) 0 [3] 0 [4]
Commodity contract derivatives 0 0
Commodity derivatives under FTP    
Swap contracts 0 [3] 0 [4]
Total 355 460
Liabilities    
Currency swap(s) 0 [3] 0 [4]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Commodity derivatives under FTP    
Swap contracts 0 [3] 0 [4]
Total 0 0
Fair Value, Inputs, Level 2    
Investments    
Equity securities 0 0
Debt Instruments    
U.S. government corporations and agencies 33 31
Corporate debt securities 341 225
Residential mortgage-backed securities 13 17
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 32 29
Institutional mutual funds 0 0
Forward debt securities contracts   (59)
Forward Contract Derivative Asset, at Fair Value 14  
Private partnerships measured at net asset value 0 [1] 0 [2]
Commingled funds measured at net asset value 0 [1] 0 [2]
Total investments 440 250
Currency swap(s) 0 [3] 25 [4]
Commodity contract derivatives 12 1
Commodity derivatives under FTP    
Swap contracts 0 [3] 0 [4]
Total 452 276
Liabilities    
Currency swap(s) 167 [3] 47 [4]
Interest rate swaps 1,912 1,627
Commodity contract derivatives 6 0
Commodity derivatives under FTP    
Swap contracts 11 [3] 27 [4]
Total 2,096 1,701
Fair Value, Inputs, Level 3    
Investments    
Equity securities 0 0
Debt Instruments    
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
Institutional mutual funds 0 0
Forward debt securities contracts 0 0
Private partnerships measured at net asset value 0 [1] 0 [2]
Commingled funds measured at net asset value 0 [1] 0 [2]
Total investments 0 0
Currency swap(s) 0 [3] 0 [4]
Commodity contract derivatives 0 0
Commodity derivatives under FTP    
Swap contracts 0 [3] 0 [4]
Total 0 0
Liabilities    
Currency swap(s) 0 [3] 0 [4]
Interest rate swaps 0 0
Commodity contract derivatives 183 98
Commodity derivatives under FTP    
Swap contracts 0 [3] 0 [4]
Total $ 183 $ 98
[1] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
[2] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
[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. TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 12 — Offsetting of Derivative Assets and Liabilities.
[4] 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, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 12 — Offsetting of Derivative Assets and Liabilities.