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Commitments and Contingencies - Table (Details)
$ in Millions
Sep. 30, 2020
USD ($)
megawatts
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Obligations      
Megawatts provided under transmission obligations | megawatts 1,450    
Accrual for Environmental Loss Contingencies, Gross $ 14 $ 15  
Estimated future decommissioning cost [1] 6,785 5,616 $ 4,779
Operating Leases, Future Minimum Payments Due, Next Twelve Months 66 76  
Operating Leases, Future Minimum Payments, Due in Two Years 51 75  
Operating Leases, Future Minimum Payments, Due in Three Years 39 60  
Operating Leases, Future Minimum Payments, Due in Four Years 37 12  
Operating Leases, Future Minimum Payments, Due in Five Years 34 3  
Operating Leases, Future Minimum Payments, Due Thereafter 16 2  
Total 243 228  
CT and QTE outstanding leaseback obligation 223 263  
Other Commitment, to be Paid, Year One 207    
Other Commitment, to be Paid, Year Two 25    
Other Commitment, to be Paid, Year Three 0    
Other Commitment, to be Paid, Year Four 0    
Other Commitment, to be Paid, Year Five 0    
Other Commitment, to be Paid, after Year Five 0    
Total 232    
Nuclear      
Obligations      
Estimated future decommissioning cost $ 3,278 $ 3,136 $ 2,989
[1] (1) Includes $345 million and $163 million at September 30, 2020 and 2019, respectively, in Current liabilities.