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Commitments and Contingencies Commitments and Contingencies - Table (Details)
$ in Millions
Sep. 30, 2019
USD ($)
megawatts
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Obligations      
Megawatts provided under transmission obligations | megawatts 1,450    
Accrual for Environmental Loss Contingencies, Gross $ 15 $ 12  
Estimated future decommissioning cost [1] 5,616 4,779 $ 4,304
2018 53    
2019 53    
2020 53    
2021 55    
2022 51    
Thereafter 418    
Total 683    
2018 76    
2019 75    
2020 60    
2021 12    
2022 3    
Thereafter 2    
Total 228    
CT and QTE outstanding leaseback obligation 263 $ 301  
2018 50    
2019 207    
2020 25    
2021 0    
2022 0    
Thereafter 0    
Total $ 282    
[1] (1) The current portions of the ARO liability in the amounts of $163 million and $115 million at September 30, 2019 and 2018, respectively, are included in Accounts payable and accrued liabilities.