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Fair Value Measurements Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Investments    
Equity securities $ 196 $ 166
Government debt securities 124 234
Corporate debt securities 393 225
Mortgage and asset-backed securities 50 53
Institutional mutual funds 92 91
Forward debt securities contracts - asset 15  
Forward debt securities contracts - liability   (59)
Private equity funds measured at net asset value 132 [1] 125 [2]
Private real estate measured at net asset value 113 [1] 115 [2]
Commingled funds measured at net asset value 1,142 [1] 1,061 [2]
Total investments 2,257 2,011
Currency swaps 0 [3] 25 [4]
Commodity contract derivatives 9 1
Swap contracts 0 [3] 0
Total 2,266 2,037
Liabilities [Abstract]    
Currency swaps 162 [3] 47 [4]
Interest rate swaps 1,938 1,627
Commodity contract derivatives 134 98
Swap contracts 9 [3] 27 [4]
Total 2,243 1,799
Fair Value, Inputs, Level 1    
Investments    
Equity securities 196 166
Government debt securities 88 203
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 92 91
Forward debt securities contracts - asset 0  
Forward debt securities contracts - liability   0
Private equity funds measured at net asset value 0 [1] 0 [2]
Private real estate measured at net asset value 0 [1] 0 [2]
Commingled funds measured at net asset value 0 [1] 0 [2]
Total investments 376 460
Currency swaps 0 [3] 0
Commodity contract derivatives 0 0
Swap contracts 0 [3] 0
Total 376 460
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
Government debt securities 36 31
Corporate debt securities 393 225
Mortgage and asset-backed securities 50 53
Institutional mutual funds 0 0
Forward debt securities contracts - asset 15  
Forward debt securities contracts - liability   (59)
Private equity funds measured at net asset value 0 [1] 0 [2]
Private real estate measured at net asset value 0 [1] 0 [2]
Commingled funds measured at net asset value 0 [1] 0 [2]
Total investments 494 250
Currency swaps 0 [3] 25
Commodity contract derivatives 5 1
Swap contracts 0 [3] 0
Total 499 276
Liabilities [Abstract]    
Currency swaps 162 [3] 47 [4]
Interest rate swaps 1,938 1,627
Commodity contract derivatives 3 0
Swap contracts 9 [3] 27 [4]
Total 2,112 1,701
Fair Value, Inputs, Level 3    
Investments    
Equity securities 0 0
Government debt securities 0 0
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 0 0
Forward debt securities contracts - asset 0  
Forward debt securities contracts - liability   0
Private equity funds measured at net asset value 0 [1] 0 [2]
Private real estate 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
Commodity contract derivatives 4 0
Swap contracts 0 [3] 0
Total 4 0
Liabilities [Abstract]    
Currency swaps 0 [3] 0 [4]
Interest rate swaps 0 0
Commodity contract derivatives 131 98
Swap contracts 0 [3] 0 [4]
Total $ 131 $ 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 14 — 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 14 — Offsetting of Derivative Assets and Liabilities.