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Regulatory Assets and Liabilities
3 Months Ended
Dec. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets and Liabilities Regulatory Assets and Liabilities
    TVA records certain assets and liabilities that result from the regulated ratemaking process that would not be recorded under GAAP for non-regulated entities. As such, certain items that would generally be reported in earnings or that would impact the Consolidated Statements of Operations are recorded as regulatory assets or regulatory 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
(in millions)
 At December 31, 2022At September 30, 2022
Current regulatory assets  
Unrealized losses on interest rate derivatives$41 $47 
Unrealized losses on commodity derivatives137 14 
Fuel cost adjustment receivable142 77 
Total current regulatory assets320 138 
Non-current regulatory assets  
Retirement benefit plans deferred costs1,809 1,839 
Non-nuclear decommissioning costs2,769 2,856 
Unrealized losses on interest rate derivatives474 479 
Nuclear decommissioning costs705 821 
Unrealized losses on commodity derivatives15 
Other non-current regulatory assets137 138 
Total non-current regulatory assets5,909 6,134 
Total regulatory assets$6,229 $6,272 
Current regulatory liabilities  
Fuel cost adjustment tax equivalents$218 $218 
Unrealized gains on commodity derivatives59 173 
Total current regulatory liabilities277 391 
Non-current regulatory liabilities  
Retirement benefit plans deferred credits66 70 
Unrealized gains on commodity derivatives43 102 
Total non-current regulatory liabilities109 172 
Total regulatory liabilities$386 $563