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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 120 $ 94
Investments    
Government debt securities 458 597
Corporate debt securities 310 411
Mortgage and asset-backed securities 75 63
Institutional mutual funds 187 225
Forward debt securities contracts 2 2
Private credit measured at net asset value 99 71
Private equity funds measured at net asset value(1) 449 357 [1]
Private real estate funds measured at net asset value(1) 345 272 [1]
Commingled funds measured at net asset value(1) 1,254 1,421 [1]
Total investments 3,751 4,053
Commodity contract derivatives 190 250
Total derivatives not subject to master netting or similar arrangement 190 250
Total 4,005 4,303
Liabilities    
Currency swaps [2] 133 83
Interest rate swaps 1,074 1,639
Commodity contract derivatives 7 3
Derivative Liability, Not Subject to Master Netting Arrangement 7 3
Total 1,226 1,725
Decommissioning Fund Investments 1,100  
Balance in NDT 2,600  
Equity Securities, FV-NI 572 634
Commodity Contract under FHP    
Investments    
Total derivatives not subject to master netting or similar arrangement 64 0
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement 12 0
Fair Value, Inputs, Level 1    
Investments    
Government debt securities 438 573
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 187 225
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 1,197 1,432
Commodity contract derivatives 0 0
Total 1,197 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 572 634
Fair Value, Inputs, Level 1 | Commodity Contract under FHP    
Investments    
Total derivatives not subject to master netting or similar arrangement 0  
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement 0  
Fair Value, Inputs, Level 2    
Investments    
Government debt securities 20 24
Corporate debt securities 310 411
Mortgage and asset-backed securities 75 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 407 500
Commodity contract derivatives 190 250
Total 661 750
Liabilities    
Currency swaps 133 83 [2]
Interest rate swaps 1,074 1,639
Commodity contract derivatives 7 3
Total 1,226 1,725
Equity Securities, FV-NI 0 0
Fair Value, Inputs, Level 2 | Commodity Contract under FHP    
Investments    
Total derivatives not subject to master netting or similar arrangement 64  
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement 12  
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    
Investments    
Total derivatives not subject to master netting or similar arrangement 0  
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement $ 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.