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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 116 $ 94
Investments    
Government debt securities 543 597
Corporate debt securities 361 411
Mortgage and asset-backed securities 77 63
Institutional mutual funds 212 225
Forward debt securities contracts 2 2
Private credit measured at net asset value 95 71
Private equity funds measured at net asset value(1) 453 357 [1]
Private real estate funds measured at net asset value(1) 331 272 [1]
Commingled funds measured at net asset value(1) 1,415 1,421 [1]
Total investments 4,200 4,053
Commodity contract derivatives 209 250
Total 4,461 4,303
Liabilities    
Currency swaps [2] 93 83
Interest rate swaps 1,368 1,639
Commodity contract derivatives 7 3
Total 1,468 1,725
Decommissioning Fund Investments 1,200  
Balance in NDT 2,900  
Equity Securities, FV-NI 711 634
Commodity Contract under FHP    
Liabilities    
Fair value 52 0
Fair Value, Inputs, Level 1    
Investments    
Government debt securities 522 573
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 212 225
Forward debt securities contracts 0 0
Private credit measured at net asset value 0 0
Private equity funds measured at net asset value(1) [1]   0
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 1,445 1,432
Commodity contract derivatives 0 0
Total 1,445 1,432
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI 711 634
Fair Value, Inputs, Level 1 | Commodity Contract under FHP    
Liabilities    
Fair value 0  
Fair Value, Inputs, Level 2    
Investments    
Government debt securities 21 24
Corporate debt securities 361 411
Mortgage and asset-backed securities 77 63
Institutional mutual funds 0 0
Forward debt securities contracts 2 2
Private credit measured at net asset value 0 0
Private equity funds measured at net asset value(1) [1]   0
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 461 500
Commodity contract derivatives 209 250
Total 722 750
Liabilities    
Currency swaps 93 83 [2]
Interest rate swaps 1,368 1,639
Commodity contract derivatives 7 3
Total 1,468 1,725
Equity Securities, FV-NI 0 0
Fair Value, Inputs, Level 2 | Commodity Contract under FHP    
Liabilities    
Fair value 52  
Fair Value, Inputs, Level 3    
Investments    
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) [1]   0
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 0 0
Total 0 0
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI 0 $ 0
Fair Value, Inputs, Level 3 | Commodity Contract under FHP    
Liabilities    
Fair value $ 0  
[1] Certain investments that are measured at fair value using the NAV 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.(4) 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.
[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.