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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 124 $ 120
Investments    
Equity securities 509 464
Government debt securities 356 344
Corporate debt securities 423 417
Mortgage and asset-backed securities 30 32
Institutional mutual funds 266 250
Forward debt securities contracts 2 22
Private credit measured at net asset value 52  
Private equity funds measured at net asset value(1) 158 140 [1]
Private real estate funds measured at net asset value(1) 142 135 [1]
Commingled funds measured at net asset value(1) 1,225 1,131 [1]
Total investments 3,163 2,968
Commodity contract derivatives 4 12
Total 3,167 2,980
Liabilities    
Currency swaps [2] 132 208
Interest rate swaps 1,565 1,764
Commodity contract derivatives 66 53
Total 1,763 2,025
Fair Value, Inputs, Level 1    
Investments    
Equity securities 509 464
Government debt securities 278 279
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 266 250
Forward debt securities contracts 0 0
Private credit measured at net asset value 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 1,053 993
Commodity contract derivatives 0 0
Total 1,053 993
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 78 65
Corporate debt securities 423 417
Mortgage and asset-backed securities 30 32
Institutional mutual funds 0 0
Forward debt securities contracts 2 22
Private credit measured at net asset value 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 533 536
Commodity contract derivatives 3 7
Total 536 543
Liabilities    
Currency swaps 132 208 [2]
Interest rate swaps 1,565 1,764
Commodity contract derivatives 48 44
Total 1,745 2,016
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 credit measured at net asset value 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 1 5
Total 1 5
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 18 9
Total $ 18 $ 9
[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 on 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 14 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.