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Commitments and Contingencies - Table (Details)
$ in Millions
Sep. 30, 2022
USD ($)
megawatts
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Obligations      
Megawatts provided under transmission obligations | megawatts 2,450    
Accrual for Environmental Loss Contingencies, Gross $ 17 $ 18  
Estimated future decommissioning cost [1] 7,162 7,002 $ 6,785
CT and QTE outstanding leaseback obligation   25  
Nuclear      
Obligations      
Estimated future decommissioning cost $ 3,643 $ 3,428 $ 3,278
[1]
(1) Includes $275 million and $266 million at September 30, 2022 and 2021, respectively, in Current liabilities.
(2) Settlements include the change in asset retirement obligation project accruals included in Accounts payable and accrued liabilities of $20 million.