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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2021
Entity Information [Line Items]
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.
Subsidiaries [Member]
Entity Information [Line Items]
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.