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Contingencies and Commitments - Loss Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Environmental Contingencies            
Liability recorded for projected environmental remediation costs       $ 4 $ 4  
AES Tiete [Domain]            
Litigation Contingencies            
Reversal of Cost of Goods $ 6   $ 184      
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       28 $ 23  
Maximum [Member] | Litigation [Member]            
Environmental Contingencies            
Loss Contingency, Estimate of Possible Loss       728    
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       $ 247