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Subsequent Events (Details)	12 Months Ended
Subsequent Events (Details)	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	16. SUBSEQUENT EVENT In February 2022, AES announced its intent to exit coal generation by year-end 2025 versus prior expectation of a reduction to below 10% by year-end 2025, subject to necessary approvals. Changes to our generation portfolio are evaluated and decided through the IRP. The impact that this new goal may have on our financial statements will be evaluated as part of the 2022 IRP.
Subsequent Event [Line Items]
Prior Expectation of Coal Reduction by 2025	10.00%
Subsidiaries [Member]
Subsequent Events [Abstract]
Subsequent Events	16. SUBSEQUENT EVENT In February 2022, AES announced its intent to exit coal generation by year-end 2025 versus prior expectation of a reduction to below 10% by year-end 2025, subject to necessary approvals. Changes to AES Indiana's generation portfolio are evaluated and decided through the IRP. The impact that this new goal may have on AES Indiana's financial statements will be evaluated as part of the 2022 IRP.
Subsequent Event [Line Items]
Prior Expectation of Coal Reduction by 2025	10.00%