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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 128 $ 120
Investments    
Equity securities 343 464
Government debt securities 348 344
Corporate debt securities 349 417
Mortgage and asset-backed securities 28 32
Institutional mutual funds 201 250
Forward debt securities contracts 10 22
Private credit measured at net asset value 48 33
Private equity funds measured at net asset value(1) 143 140 [1]
Private real estate funds measured at net asset value(1) 161 135 [1]
Commingled funds measured at net asset value(1) 976 1,131 [1]
Total investments 2,607 2,968
Commodity contract derivatives 4 12
Total 2,611 2,980
Liabilities    
Currency swaps [2] 295 208
Interest rate swaps 2,150 1,764
Commodity contract derivatives 60 53
Total 2,505 2,025
Fair Value, Inputs, Level 1    
Investments    
Equity securities 343 464
Government debt securities 289 279
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 201 250
Forward debt securities contracts 0 0
Private credit measured at net asset value 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 833 993
Commodity contract derivatives 0 0
Total 833 993
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 59 65
Corporate debt securities 349 417
Mortgage and asset-backed securities 28 32
Institutional mutual funds 0 0
Forward debt securities contracts 10 22
Private credit measured at net asset value 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 446 536
Commodity contract derivatives 3 7
Total 449 543
Liabilities    
Currency swaps 295 208 [2]
Interest rate swaps 2,150 1,764
Commodity contract derivatives 52 44
Total 2,497 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 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 8 9
Total $ 8 $ 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.