Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Percent	45.00%	108.00%	42.00%	48.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Proceeds from Divestiture of Businesses and Interests in Affiliates			$ 58	$ 44
Income Tax Expense (Benefit)	$ (59)	$ 113	(51)	202
Gener Subsidiary [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	0
DPL Subsidiary [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)		25		25
AES Mexico [Member]
Income Tax Disclosures [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation				13
Clean Energy
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	39		46
AES Gener
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)		$ 13		$ 21
Fluence [Member]
Income Tax Disclosures [Line Items]
Income Tax Expense (Benefit)	$ 13		$ 13