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Regulatory Assets and Liabilities
 9 Months Ended
Jun. 30, 2020
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets and Liabilities Regulatory Assets and Liabilities
        Regulatory assets generally represent incurred costs that have been deferred because such costs are probable of future recovery in customer rates.  Regulatory liabilities generally represent obligations to make refunds to customers for previous collections for costs that are not likely to be incurred or deferral of gains that will be credited to customers in future periods.  Components of regulatory assets and regulatory liabilities are summarized in the table below:
Regulatory Assets and Liabilities
 At June 30, 2020At September 30, 2019
Current regulatory assets  
Unrealized losses on interest rate derivatives$111  $89  
Unrealized losses on commodity derivatives38  39  
Fuel cost adjustment receivable—  28  
Total current regulatory assets149  156  
Non-current regulatory assets  
Deferred pension costs and other post-retirement benefits costs4,524  4,756  
Non-nuclear decommissioning costs2,012  1,741  
Nuclear decommissioning costs963  868  
Unrealized losses on interest rate derivatives1,603  1,241  
Unrealized losses on commodity contracts2  15  
Other non-current regulatory assets147  142  
Total non-current regulatory assets9,251  8,763  
Total regulatory assets$9,400  $8,919  
Current regulatory liabilities  
Fuel cost adjustment tax equivalents$121  $138  
Fuel cost adjustment 71  —  
Unrealized gains on commodity derivatives5  12  
Total current regulatory liabilities197  150  
Non-current regulatory liabilities  
Unrealized gains on commodity derivatives5  —  
Total regulatory liabilities$202  $150  
Due to higher volatility in the financial markets associated with the COVID-19 pandemic, TVA has experienced unrealized losses related to its derivative instruments for the nine months ended June 30, 2020. TVA does not recognize unrealized gains and losses from the investment portfolios and derivative instruments within earnings but rather defers all such gains and losses within a regulatory liability or asset in accordance with its accounting policy. See Note 14 — Risk Management Activities and Derivative Transactions and Note 15 — Fair Value Measurements.