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Risk Management Activities and Derivative Transactions (Tables)
 6 Months Ended
Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of Derivative Instruments That Receive Hedge Accounting Treatment The following tables summarize the accounting treatment that certain of TVA's financial derivative transactions receive:
Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 1) 
Amount of Mark-to-Market Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
(in millions)
Three Months Ended March 31Six Months Ended March 31
Derivatives in Cash Flow Hedging RelationshipObjective of Hedge TransactionAccounting for Derivative
Hedging Instrument		2022202120222021
Currency swapsTo protect against changes in cash flows caused by changes in foreign currency exchange rates (exchange rate risk)Unrealized gains and losses are recorded in AOCI and reclassified to Interest expense to the extent they are offset by gains and losses on the hedged transaction$(15)$22 $(10)$123 
Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 2)(1)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Interest Expense
(in millions)
Three Months Ended March 31Six Months Ended March 31
Derivatives in Cash Flow Hedging Relationship2022202120222021
Currency swaps$(17)$5 $(16)$50 
Note
(1) There were no amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $18 million of gains from AOCI to Interest expense within the next 12 months to offset amounts anticipated to be recorded in Interest expense related to exchange gain on the debt.
Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment
Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment
Amount of Gain (Loss) Recognized in Income on Derivatives(1)(2)
Three Months Ended March 31Six Months Ended March 31
Derivative TypeObjective of DerivativeAccounting for Derivative Instrument2022202120222021
Interest rate swapsTo fix short-term debt variable rate to a fixed rate (interest rate risk)Mark-to-market gains and losses are recorded as regulatory liabilities and assets, respectively

Realized gains and losses are recognized in Interest expense when incurred during the settlement period and are presented in operating cash flow		$(28)$(28)$(57)$(57)
Notes
(1) All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there were no related gains (losses) recognized in income for these unrealized gains (losses) for the three and six months ended March 31, 2022 and 2021.
(2) For the three and six months ended March 31, 2022 and 2021, there were no realized gains or losses recognized for the commodity derivatives under the FHP.
Fair Value of TVA Derivatives
Fair Values of TVA Derivatives
(in millions)
 At March 31, 2022At September 30, 2021
Derivatives That Receive Hedge Accounting Treatment:
BalanceBalance Sheet PresentationBalanceBalance Sheet Presentation
Currency swaps    
£250 million Sterling
$(43)
Accounts payable and accrued liabilities $(5); Other long-term liabilities $(38)
$(36)
Accounts payable and accrued liabilities $(4); Other long-term liabilities $(32)
£150 million Sterling
(50)
Accounts payable and accrued liabilities $(3); Other long-term liabilities $(47)
(47)
Accounts payable and
accrued liabilities $(3); Other long-term liabilities $(44)
Derivatives That Do Not Receive Hedge Accounting Treatment:
BalanceBalance Sheet PresentationBalanceBalance Sheet Presentation
Interest rate swaps    
$1.0 billion notional$(994)
Accounts payable and
accrued liabilities $(32); Accrued interest $(38);
Other long-term liabilities
$(924)
$(1,182)
Accounts payable and
accrued liabilities $(44); Accrued interest $(37); Other long-term liabilities $(1,101)
$476 million notional(373)
Accounts payable and
accrued liabilities $(15); Accrued interest $(9);
Other long-term liabilities
$(349)
(455)
Accounts payable and
accrued liabilities $(22); Accrued interest $(10);
Other long-term liabilities
$(423)
$42 million notional(1)
(1)
Accrued interest $(1)
(2)
Accounts payable and
accrued liabilities $(1); Accrued interest $(1)
Commodity contract derivatives202 
Other current assets $178; Other long-term assets $31; Accounts payable and accrued liabilities $(4); Other long-term liabilities $(3)
247 
Other current assets $210; Other long-term assets $40; Accounts payable and accrued liabilities $(3)
Commodity derivatives under the FHP52 
Accounts receivable, net $1; Other current assets $29; Other long-term assets $22
— N/A
Note
(1) At September 30, 2021, represented two interest rate swaps with notional amounts of $28 million and $14 million. In January 2022, the final payment was made on the $28 million notional interest rate swap, and therefore at March 31, 2022, only the $14 million notional interest rate swap remained.
Commodity Contract Derivatives
Commodity Contract Derivatives 
 At March 31, 2022At September 30, 2021
 
Number of Contracts
Notional Amount
Fair Value (MtM)
(in millions)
Number of ContractsNotional Amount
Fair Value (MtM)
(in millions)
Natural gas contract derivatives29299 million mmBtu$202 40263 million mmBtu$247 
Offsetting Assets and Liabilities The amounts of TVA's derivative instruments as reported on the Consolidated Balance Sheets are shown in the table below:
Derivative Assets and Liabilities(1)
(in millions)
 At March 31, 2022At September 30, 2021
Assets
Commodity contract derivatives$209 $250 
Commodity derivatives under the FHP52 — 
Total derivatives subject to master netting or similar arrangement$261 $250 
Liabilities
Currency swaps(2)
$93 $83 
Interest rate swaps(2)
1,368 1,639 
Commodity contract derivatives 7 3 
Total derivatives subject to master netting or similar arrangement$1,468 $1,725 
Notes
(1) Offsetting amounts include counterparty netting of derivative contracts. There were no material offsetting amounts on TVA's Consolidated Balance Sheets at either March 31, 2022, or September 30, 2021.
(2) Letters of credit of approximately $1.0 billion and $1.2 billion were posted as collateral at March 31, 2022, and September 30, 2021, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives.