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Summary of Significant Accounting Policies Revenues (Details)
$ in Millions
 9 Months Ended
Jun. 30, 2023
USD ($)
Item
Accounting Policies [Abstract]  
Number of customers with billing dates before month end | Item 5
Property, Plant and Equipment [Line Items]  
Pre-commercial Ops - capitalized revenue $ 1
Pre-commercial Ops - Capitalized Fuel $ 1