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Other Income and Expense - Other Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
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 |  |  |  |  | $ 9 |  | $ 37 |
Other Nonoperating Income | $ 48 |  | $ 6 |  | 274 |  | 60 |
Clean Energy |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income [Line Items] |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | 178 |  |  |  | 214 |  |  |
Colon [Domain] |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income [Line Items] |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain |  |  |  |  | 6 |  |  |
Other Income [Member] |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income [Line Items] |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | 8 | [1] | 0 |  | 220 | [1] | 0 |
Gain (Loss) on Disposition of Other Assets | 1 |  | 0 |  | 2 |  | 43 | [2]
Other income | 5 |  | 4 |  | 14 |  | 13 |
Other Nonoperating Income | $ 48 |  | $ 6 |  | $ 274 |  | $ 60 |
[1] | For the three months ended September 30, 2021, primarily related to the $6 million remeasurement of our existing equity interest in Gas Natural Atlántico II, S. de. R.L.’s assets to their acquisition-date fair value. See Note 7—Investments in and Advances to Affiliates for further information. For the nine months ended September 30, 2021, primarily related to the $214 million 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 19—Acquisitions for further information.
[2] | Primarily associated with the gain on sale of Redondo Beach land at Southland for the nine months ended September 30, 2020. See Note 18—Held-for-Sale and Dispositions for further information.

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