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Contingencies and Commitments - Loss Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2020
Environmental Contingencies          
Liability recorded for projected environmental remediation costs   $ 4 $ 10    
AES Tiete [Domain]          
Litigation Contingencies          
Reversal of Cost of Goods   6      
AES Tiete [Domain] | Compensation from Concession Agreement          
Litigation Contingencies          
Other Intangible Assets, Net       $ 190 $ 184
AES Tiete [Domain] | Compensation from Concession Agreement          
Litigation Contingencies          
Deferred Compensation Arrangement with Individual, Requisite Service Period 2 years 8 months 12 days        
Litigation [Member]          
Litigation Contingencies          
Aggregate reserves for claims deemed both probable and reasonably estimable   $ 23      
Maximum [Member] | Litigation [Member]          
Environmental Contingencies          
Loss Contingency, Estimate of Possible Loss     704    
Maximum [Member] | Environmental Issue          
Environmental Contingencies          
Loss Contingency, Estimate of Possible Loss     12    
Minimum [Member] | Litigation [Member]          
Environmental Contingencies          
Loss Contingency, Estimate of Possible Loss     $ 239