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Supply Chain Financing (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Related Party Transaction [Line Items]    
Guarantees issued $ 100.0  
AES Grid Stability | Affiliated Entity    
Related Party Transaction [Line Items]    
Guarantees issued 50.0  
Siemens Industry | Affiliated Entity    
Related Party Transaction [Line Items]    
Guarantees issued 50.0  
Supply Chain Financing Bank    
Related Party Transaction [Line Items]    
Payables outstanding subject to the program $ 93.2 $ 58.4