Other Income and Expense - Other Income (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021
Schedule of Other Nonoperating Income [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain				$ 36
Gain (Loss) on Disposition of Other Assets	$ (4)		$ 20
Other Nonoperating Income	6		43
Other Income [Member]
Schedule of Other Nonoperating Income [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	0	[1]	36
Other income	3		5
Other Nonoperating Income	$ 6		$ 43

[1] Related to the remeasurement of our existing equity interest in sPower’s development platform as part of the step acquisition to form AES Clean Energy Development. See Note 17—Acquisitions for further information.