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Fair Value Measurements Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Investments    
Equity securities $ 166 $ 162
Debt securities    
U.S. government corporations and agencies 234 82
Corporate debt securities 225 290
Residential mortgage-backed securities 17 14
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 29 29
Institutional mutual funds 91 101
Private partnerships measured at net asset value 240 [1] 214 [2]
Commingled funds measured at net asset value 1,061 [1] 1,079 [2]
Total investments 2,011 1,981
Currency swaps 25 [3] 0 [4]
Commodity contract derivatives 1 1
Swap contracts 0 [3] 0
Total 2,037 1,982
Forward Contract Derivative Asset, at Fair Value   3
Forward Contract Derivative Liability, at Fair Value 59  
Liabilities [Abstract]    
Currency swaps 47 [3] 15 [4]
Interest rate swaps 1,627 1,348
Commodity contract derivatives 98 97
Swap contracts 27 [3] 34 [4]
Total 1,799 1,494
Fair Value, Inputs, Level 1    
Investments    
Equity securities 166 162
Debt securities    
U.S. government corporations and agencies 203 46
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 91 101
Private partnerships measured at net asset value 0 [1] 0 [2]
Commingled funds measured at net asset value 0 [1] 0 [2]
Total investments 460 309
Currency swaps 0 [3] 0 [4]
Commodity contract derivatives 0 0
Swap contracts 0 [3] 0
Total 460 309
Forward Contract Derivative Asset, at Fair Value   0
Forward Contract Derivative Liability, at Fair Value 0  
Liabilities [Abstract]    
Currency swaps 0 [3] 0 [4]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Swap contracts 0 [3] 0 [4]
Total 0 0
Fair Value, Inputs, Level 2    
Investments    
Equity securities 0 0
Debt securities    
U.S. government corporations and agencies 31 36
Corporate debt securities 225 290
Residential mortgage-backed securities 17 14
Commercial mortgage-backed securities 7 7
Collateralized debt obligations 29 29
Institutional mutual funds 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 250 379
Currency swaps 25 [3] 0 [4]
Commodity contract derivatives 0 0
Swap contracts 0 [3] 0
Total 275 379
Forward Contract Derivative Asset, at Fair Value   3
Forward Contract Derivative Liability, at Fair Value 59  
Liabilities [Abstract]    
Currency swaps 47 [3] 15 [4]
Interest rate swaps 1,627 1,348
Commodity contract derivatives 0 0
Swap contracts 27 [3] 34 [4]
Total 1,701 1,397
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
Institutional mutual funds 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 swaps 0 [3] 0 [4]
Commodity contract derivatives 1 1
Swap contracts 0 [3] 0
Total 1 1
Forward Contract Derivative Asset, at Fair Value   0
Forward Contract Derivative Liability, at Fair Value 0  
Liabilities [Abstract]    
Currency swaps 0 [3] 0 [4]
Interest rate swaps 0 0
Commodity contract derivatives 98 97
Swap contracts 0 [3] 0 [4]
Total $ 98 $ 97
[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 16 — 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 any 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 16 — Offsetting of Derivative Assets and Liabilities.