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Subsequent Events Subsequent Events (Notes)	6 Months Ended
Subsequent Events Subsequent Events (Notes)	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS Fluence — In July 2017, the Company entered into a joint venture with Siemens AG to form a global energy storage technology and services company under the name Fluence. Siemens and AES will have joint control of the Company with each holding a 50% stake. The transaction is expected to close in the fourth quarter of 2017, subject to regulatory approval. sPower — On July 25, 2017, the Company and AIMCo completed the acquisition of sPower. See Note 17— Acquisitions for further discussion. Alto Sertao II — On August 3, 2017, the Company completed the acquisition of Alto Sertao II. See Note 17— Acquisitions for further discussion.