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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Financing Receivable, after Allowance for Credit Loss $ 113   $ 113   $ 96
Investments          
Government debt securities 546   546   451
Corporate debt securities 340   340   300
Mortgage and asset-backed securities 41   41   36
Institutional mutual funds 319   319   288
Forward debt securities contracts 4   4   11
Private credit measured at net asset value 199   199   158
Private equity funds measured at net asset value(1) 684   684   583 [1]
Private real estate funds measured at net asset value(1) 427   427   387 [1]
Commingled funds measured at net asset value(1) 1,224   1,224   1,156 [1]
Total investments 4,693   4,693   4,123
Commodity contract derivatives 18   18   33
Total 4,711   4,711   4,160
Liabilities          
Currency swaps [2] 124   124   141
Interest rate swaps 692   692   662
Commodity contract derivatives 4   4   2
Total 997   997   991
Equity Securities, FV-NI 729   729   608
Cash, Cash Equivalents, and Short-Term Investments 180   180   145
Interest Rate Derivative Assets, at Fair Value         4
Government debt securities reclassed         104
Commingled funds reclassed         21
Commodity Contract under FHP          
Liabilities          
Derivative Liability, Not Subject to Master Netting Arrangement 177   177   186
NDT [Member]          
Liabilities          
Debt and Equity Securities, Unrealized Gain (Loss) 7 $ 31 70 $ 79  
Debt and Equity Securities, Unrealized Gain (Loss) 7 31 70 79  
ART [Member]          
Liabilities          
Debt and Equity Securities, Unrealized Gain (Loss) 1 7 24 23  
Debt and Equity Securities, Unrealized Gain (Loss) 1 $ 7 24 $ 23  
RP          
Liabilities          
Debt and Equity Securities, Unrealized Gain (Loss)     1    
Debt and Equity Securities, Unrealized Gain (Loss)     1    
Fair Value, Inputs, Level 1          
Investments          
Government debt securities 489   489   391
Corporate debt securities 0   0   0
Mortgage and asset-backed securities 0   0   0
Institutional mutual funds 319   319   288
Forward debt securities contracts 0   0   0
Private credit measured at net asset value 0   0   0
Private equity funds measured at net asset value(1) 0   0   0 [1]
Private real estate funds measured at net asset value(1) 0   0   0 [1]
Commingled funds measured at net asset value(1) 0   0   0 [1]
Total investments 1,537   1,537   1,287
Commodity contract derivatives 0   0   0
Total 1,537   1,537   1,287
Liabilities          
Currency swaps 0   0   0 [2]
Interest rate swaps 0   0   0
Commodity contract derivatives 0   0   0
Total 0   0   0
Equity Securities, FV-NI 729   729   608
Cash, Cash Equivalents, and Short-Term Investments 0   0   0
Interest Rate Derivative Assets, at Fair Value         0
Fair Value, Inputs, Level 1 | Commodity Contract under FHP          
Liabilities          
Derivative Liability, Not Subject to Master Netting Arrangement 0   0   0
Fair Value, Inputs, Level 2          
Investments          
Government debt securities 57   57   60
Corporate debt securities 340   340   300
Mortgage and asset-backed securities 41   41   36
Institutional mutual funds 0   0   0
Forward debt securities contracts 4   4   11
Private credit measured at net asset value 0   0   0
Private equity funds measured at net asset value(1) 0   0   0 [1]
Private real estate funds measured at net asset value(1) 0   0   0 [1]
Commingled funds measured at net asset value(1) 0   0   0 [1]
Total investments 622   622   552
Commodity contract derivatives 18   18   33
Total 640   640   589
Liabilities          
Currency swaps 124   124   141 [2]
Interest rate swaps 692   692   662
Commodity contract derivatives 4   4   2
Total 997   997   991
Equity Securities, FV-NI 0   0   0
Cash, Cash Equivalents, and Short-Term Investments 180   180   145
Interest Rate Derivative Assets, at Fair Value         4
Fair Value, Inputs, Level 2 | Commodity Contract under FHP          
Liabilities          
Derivative Liability, Not Subject to Master Netting Arrangement 177   177   186
Fair Value, Inputs, Level 3          
Investments          
Government debt securities 0   0   0
Corporate debt securities 0   0   0
Mortgage and asset-backed securities 0   0   0
Institutional mutual funds 0   0   0
Forward debt securities contracts 0   0   0
Private credit measured at net asset value 0   0   0
Private equity funds measured at net asset value(1) 0   0   0 [1]
Private real estate funds measured at net asset value(1) 0   0   0 [1]
Commingled funds measured at net asset value(1) 0   0   0 [1]
Total investments 0   0   0
Commodity contract derivatives 0   0   0
Total 0   0   0
Liabilities          
Currency swaps 0   0   0 [2]
Interest rate swaps 0   0   0
Commodity contract derivatives 0   0   0
Total 0   0   0
Equity Securities, FV-NI 0   0   0
Cash, Cash Equivalents, and Short-Term Investments 0   0   0
Interest Rate Derivative Assets, at Fair Value         0
Fair Value, Inputs, Level 3 | Commodity Contract under FHP          
Liabilities          
Derivative Liability, Not Subject to Master Netting Arrangement $ 0   $ 0   $ 0
[1] Certain investments that are measured at fair value using the NAV or its equivalent (alternative investments) have not been categorized in the fair value hierarchy. The inputs to these fair value measurements include underlying NAVs, discounted cash flow valuations, comparable market valuations, and adjustments for currency, credit, liquidity, and other risks. 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 if applicable, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — 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 if applicable, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.