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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Financing Receivable, after Allowance for Credit Loss $ 97   $ 96
Investments      
Government debt securities 522   451
Corporate debt securities 321   300
Mortgage and asset-backed securities 37   36
Institutional mutual funds 309   288
Forward debt securities contracts 3   11
Private credit measured at net asset value 184   158
Private equity funds measured at net asset value(1) 657   583 [1]
Private real estate funds measured at net asset value(1) 408   387 [1]
Commingled funds measured at net asset value(1) 1,184   1,156 [1]
Total investments 4,472   4,123
Commodity contract derivatives 31   33
Total 4,503   4,160
Liabilities      
Currency swaps [2] 121   141
Interest rate swaps 818   662
Commodity contract derivatives 2   2
Total 1,250   991
Equity Securities, FV-NI 684   608
Cash, Cash Equivalents, and Short-Term Investments 163   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 309   186
NDT [Member]      
Liabilities      
Debt and Equity Securities, Unrealized Gain (Loss) 61 $ 20  
Debt and Equity Securities, Unrealized Gain (Loss) 61 20  
ART [Member]      
Liabilities      
Debt and Equity Securities, Unrealized Gain (Loss) 18 10  
Debt and Equity Securities, Unrealized Gain (Loss) 18 $ 10  
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 453   391
Corporate debt securities 0   0
Mortgage and asset-backed securities 0   0
Institutional mutual funds 309   288
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 1,446   1,287
Commodity contract derivatives 0   0
Total 1,446   1,287
Liabilities      
Currency swaps 0   0 [2]
Interest rate swaps 0   0
Commodity contract derivatives 0   0
Total 0   0
Equity Securities, FV-NI 684   608
Cash, Cash Equivalents, and Short-Term Investments 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
Fair Value, Inputs, Level 2      
Investments      
Government debt securities 69   60
Corporate debt securities 321   300
Mortgage and asset-backed securities 37   36
Institutional mutual funds 0   0
Forward debt securities contracts 3   11
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 593   552
Commodity contract derivatives 31   33
Total 624   589
Liabilities      
Currency swaps 121   141 [2]
Interest rate swaps 818   662
Commodity contract derivatives 2   2
Total 1,250   991
Equity Securities, FV-NI 0   0
Cash, Cash Equivalents, and Short-Term Investments 163   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 309   186
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) 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 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
Cash, Cash Equivalents, and Short-Term Investments 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
[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.