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Contingencies and Commitments - Loss Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Environmental Contingencies
Liability recorded for projected environmental remediation costs		$ 5	$ 3
AES Tiete [Domain]
Litigation Contingencies
Reversal of Cost of Goods	$ 6	184
AES Tiete [Domain] | Compensation from Concession Agreement
Litigation Contingencies
Other Intangible Assets, Net	$ 190	184
AES Tiete [Domain] | Compensation from Concession Agreement
Litigation Contingencies
Deferred Compensation Arrangement with Individual, Requisite Service Period			2 years 8 months 12 days
Litigation [Member]
Litigation Contingencies
Aggregate reserves for claims deemed both probable and reasonably estimable		$ 28	$ 41
Maximum [Member] | Litigation [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss			929
Maximum [Member] | Environmental Issue
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss			13
Minimum [Member] | Litigation [Member]
Environmental Contingencies
Loss Contingency, Estimate of Possible Loss			$ 260

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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