Other Income and Expense - Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Schedule of Other Nonoperating Income [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 36	[1]	$ 0
Gain (Loss) on Disposition of Other Assets	20		42
Other Nonoperating Income	43		45
Other Income [Member]
Schedule of Other Nonoperating Income [Line Items]
Gain (Loss) on Disposition of Other Assets	0		43	[2]
Other income	7		2
Other Nonoperating Income	$ 43		$ 45

[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 18—Acquisitions for further information.

[2] Primarily associated with the gain on sale of Redondo Beach land at Southland. See Note 17—Held-for-Sale and Dispositions for further information.