Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Percent	22.00%	28.00%	16.00%	(60.00%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Proceeds from Divestiture of Businesses and Interests in Affiliates			$ 91	$ 41
Income Tax Expense (Benefit)	$ 126	$ (147)	75	55
Gener Subsidiary [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	(72)
Guacolda [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	28		20
AES Mexico [Member]
Income Tax Disclosures [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation				11
AES Gener
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)				21
DP&L [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)				$ 25
AES Tiete [Domain]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	96		96
AES Tiete [Domain] | Parent [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	$ 44		$ 44