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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, Net $ 124 $ 123
Investments    
Equity securities 193 220
Government debt securities 214 236
Corporate debt securities 442 499
Mortgage and asset-backed securities 35 50
Institutional mutual funds 209 126
Forward debt securities contracts 43 45
Private equity funds measured at net asset value(1) 118 132 [1]
Private real estate funds measured at net asset value(1) 126 124 [1]
Commingled funds measured at net asset value(1) 1,195 1,430 [1]
Total investments 2,592 2,862
Commodity contract derivatives 77 72
Total 2,669 2,934
Liabilities    
Currency swaps [2] 146 94
Interest rate swaps 1,280 1,199
Commodity contract derivatives 10 12
Total 1,436 1,305
Fair Value, Inputs, Level 1    
Investments    
Equity securities 194 220
Government debt securities 174 199
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 209 126
Forward debt securities contracts 0 0
Private equity funds measured at net asset value(1) 0 0 [1]
Private real estate funds measured at net asset value(1) 0 0 [1]
Commingled funds measured at net asset value(1) 0 0 [1]
Total investments 577 545
Commodity contract derivatives 0 0
Total 577 545
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Fair Value, Inputs, Level 2    
Investments    
Equity securities 0 0
Government debt securities 40 37
Corporate debt securities 442 499
Mortgage and asset-backed securities 35 50
Institutional mutual funds 0 0
Forward debt securities contracts 43 45
Private equity funds measured at net asset value(1) 0 0 [1]
Private real estate funds measured at net asset value(1) 0 0 [1]
Commingled funds measured at net asset value(1) 0 0 [1]
Total investments 560 631
Commodity contract derivatives 14 13
Total 574 644
Liabilities    
Currency swaps 146 94 [2]
Interest rate swaps 1,280 1,199
Commodity contract derivatives 10 11
Total 1,436 1,304
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 0 0
Private equity funds measured at net asset value(1) 0 0 [1]
Private real estate funds measured at net asset value(1) 0 0 [1]
Commingled funds measured at net asset value(1) 0 0 [1]
Total investments 0 0
Commodity contract derivatives 63 59
Total 63 59
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 0 1
Total $ 0 $ 1
[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] 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 13 — Offsetting of Derivative Assets and Liabilities.