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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 100 $ 96
Investments    
Government debt securities 448 394
Corporate debt securities 302 283
Mortgage and asset-backed securities 29 52
Institutional mutual funds 260 242
Forward debt securities contracts 9 4
Private credit measured at net asset value 124 103
Private equity funds measured at net asset value(1) 537 487 [1]
Private real estate funds measured at net asset value(1) 391 369 [1]
Commingled funds measured at net asset value(1) 1,238 1,203 [1]
Total investments 3,913 3,671
Commodity contract derivatives 80 152
Total derivatives not subject to master netting or similar arrangement 80 152
Total 4,015 3,946
Liabilities    
Currency swaps [2] 169 240
Interest rate swaps 857 905
Commodity contract derivatives 9 7
Derivative Liability, Not Subject to Master Netting Arrangement 9 7
Total 1,178 1,160
Decommissioning Fund Investments 1,100  
Balance in NDT 2,700  
Equity Securities, FV-NI 575 534
Commodity Contract under FHP    
Investments    
Total derivatives not subject to master netting or similar arrangement 22 123
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement 143 8
Fair Value, Inputs, Level 1    
Investments    
Government debt securities 402 358
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 260 242
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 1,237 1,134
Commodity contract derivatives 0 0
Total 1,237 1,134
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI 575 534
Fair Value, Inputs, Level 1 | Commodity Contract under FHP    
Investments    
Total derivatives not subject to master netting or similar arrangement 0 0
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement 0 0
Fair Value, Inputs, Level 2    
Investments    
Government debt securities 46 36
Corporate debt securities 302 283
Mortgage and asset-backed securities 29 52
Institutional mutual funds 0 0
Forward debt securities contracts 9 4
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 386 375
Commodity contract derivatives 80 152
Total 488 650
Liabilities    
Currency swaps 169 240 [2]
Interest rate swaps 857 905
Commodity contract derivatives 9 7
Total 1,178 1,160
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 22 123
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement 143 8
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 0
Liabilities    
Derivative Liability, Not Subject to Master Netting Arrangement $ 0 $ 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 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.