Risks and Uncertainties (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Unusual Risk or Uncertainty [Line Items]
Debt Default Amount	$ 998
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	1,282	$ 1,197
PUERTO RICO | Covenant Violation [Member]
Unusual Risk or Uncertainty [Line Items]
Debt Default Amount	334
Alto Maipo [Member] | Covenant Violation [Member]
Unusual Risk or Uncertainty [Line Items]
Debt Default Amount	629
AES llumina [Member] | Covenant Violation [Member]
Unusual Risk or Uncertainty [Line Items]
Debt Default Amount	35
Alto Maipo [Member]
Unusual Risk or Uncertainty [Line Items]
Assets Carrying Amount Disclosure Nonrecurring	1,500
Deferred Tax Assets, Net	55
Project Budgeted Cost	$ 2,000