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Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 75.00% |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | $ 36 | [1] | $ 0
Equity Method Investment, Ownership Percentage | 10.00% |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage | 25.00% |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 81 |  |
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination | $ 7 |  |
AIMco |  |  |
Business Acquisition [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 25.00% |  |
sPower [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 77 |  |
[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.

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