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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details)
$ in Millions
3 Months Ended
Dec. 31, 2022
USD ($)
Mar. 31, 2022
Bond_issues
Derivative    
Number of currency swaps outstanding | Bond_issues   2
Associated TVA bond issues currency exposure | $ $ 400  
Minimum    
Derivative    
Expiration date range of swaps 2032  
Maximum    
Derivative    
Expiration date range of swaps 2043