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Fair Value (Nonrecurring Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value | Level 3 |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 548 |  |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Liabilities Value |  | (90) |  |  |
Laurel Mountain [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | $ 30
Kilroot [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  |  |  | $ 5
Long Lived Assets Held For Sale [Member] | Level 3 | OPGC Affiliate [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  |  | $ 152 | $ 212 |
Long Lived Assets Held And Used [Member] | Fair Value | AES Panama |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 44 |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Kilroot [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring | [1] |  |  | $ 103 |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | Gener Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 306 |  |  |
Long Lived Assets Held And Used [Member] | Fair Value | Level 3 | AES Panama |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 14 |  |  |
Long Lived Assets Held And Used [Member] | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | 103 |  |  |
Long Lived Assets Held And Used [Member] | Level 3 | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Assets Carrying Amount Disclosure Nonrecurring |  | $ 76 |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Minimum | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (90.00%) |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Maximum | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 10.00% |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Weighted Average | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (2.00%) |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (12.00%) |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | OPGC Affiliate [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (25.00%) |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 13.00% |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | OPGC Affiliate [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 40.00% |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 0.00% |  |  |
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | OPGC Affiliate [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 2.00% |  |  |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Minimum | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (94.00%) |  |  |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Maximum | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 24.00% |  |  |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Weighted Average | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | (3.00%) |  |  |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 24.00% |  |  |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 35.00% |  |  |
Measurement Input, Operating Margin [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 29.00% |  |  |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Minimum | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 7.00% |  |  |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Maximum | AES Gener |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 10.00% |  |  |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 10.00% |  |  |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum | Hawaii Subsidiary [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 13.00% |  |  |
Measurement Input, Discount Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average | OPGC Affiliate [Member] |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 12.00% |  |  |
Sale price per kilowatt (USD) | Valuation, Income Approach [Member] | Minimum | Estrella del Mar I |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 16000.00% |  |  |
Sale price per kilowatt (USD) | Valuation, Income Approach [Member] | Maximum | Estrella del Mar I |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 52000.00% |  |  |
Sale price per kilowatt (USD) | Valuation, Income Approach [Member] | Weighted Average | Estrella del Mar I |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 31500.00% |  |  |
Age of unit when sold | Valuation, Income Approach [Member] | Minimum | Estrella del Mar I |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 1500.00% |  |  |
Age of unit when sold | Valuation, Income Approach [Member] | Maximum | Estrella del Mar I |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 2500.00% |  |  |
Age of unit when sold | Valuation, Income Approach [Member] | Weighted Average | Estrella del Mar I |  |  |  |  |
Fair Value Assets Measured On Nonrecurring Basis Unobservable Inputs [Line Items] |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring |  | 1800.00% |  |  |
[1] | See Note 22—Asset Impairment Expense for further information.(3)See Note 8—In vestments I n and Advances to Affiliates for further information.

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