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General and Summary of Significant Accounting Policies New Accounting Pronouncements Adopted (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 109 |  |  |  |  |  | $ 116 |  |  |  |  |  |  |  | $ 109 | $ 116 |  |  |  |
Other Assets, Noncurrent | 1,635 |  |  |  |  |  | 1,514 |  |  |  |  |  |  |  | 1,635 | 1,514 |  | $ 1,767 |  |
Operating Lease, Right-of-Use Asset | 248 |  |  |  |  |  |  |  |  |  |  |  |  |  | 248 |  |  |  |  |
Revenues | 2,431 |  | $ 2,625 | $ 2,483 |  | $ 2,650 | 2,622 |  | $ 2,837 |  | $ 2,537 |  | $ 2,740 |  | 10,189 | 10,736 | $ 10,530 |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,840) | (8,163) | (8,065) |  |  |
Gross Profit | 560 |  | 701 | 502 |  | 586 | 646 |  | 671 |  | 600 |  | 656 |  | 2,349 | 2,573 | 2,465 |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 318 | 310 | 244 |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145 | 72 | 120 |  |  |
Other Assets, Current | 802 |  |  |  |  |  | 807 |  |  |  |  |  |  |  | 802 | 807 | 630 |  | $ 691 |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 156 |  |  |  |  |  | 97 |  |  |  |  |  |  |  | 156 | 97 | 130 |  | 106 |
Service Concession Assets |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 1,360 |  | 0 |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 1,351 |  |  |  |  |  | 1,423 |  |  |  |  |  |  |  | 1,351 | 1,423 | 0 |  | 1,490 |
Assets | 33,648 |  |  |  |  |  | 32,521 |  |  |  |  |  |  |  | 33,648 | 32,521 | 33,112 |  |  |
Retained Earnings (Accumulated Deficit) | (692) |  |  |  |  |  | (1,005) |  |  |  |  |  |  |  | (692) | (1,005) | (2,276) |  | (2,209) |
Cash and Cash Equivalents, at Carrying Value | 1,029 |  |  |  |  |  | 1,166 |  |  |  |  |  |  |  | 1,029 | 1,166 |  |  |  |
Restricted Cash and Cash Equivalents, Current | 336 |  |  |  |  |  | 370 |  |  |  |  |  |  |  | 336 | 370 |  |  |  |
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Net of Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (227) | (151) | 919 |  |  |
Debt service reserves and other deposits | 207 |  |  |  |  |  | 467 |  |  |  |  |  |  |  | 207 | 467 |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 1,572 |  |  |  |  |  | 2,003 |  |  |  |  |  |  |  | 1,572 | 2,003 | 1,788 |  |  | $ 1,960
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,229) |  |  |  |  |  | (2,071) |  |  |  |  |  |  |  | (2,229) | (2,071) | (1,876) |  | (1,857) |
Stockholders' Equity Attributable to Noncontrolling Interest | 2,233 |  |  |  |  |  | 2,396 |  |  |  |  |  |  |  | 2,233 | 2,396 | 2,380 |  | 2,461 |
Liabilities and Equity | 33,648 |  |  |  |  |  | 32,521 |  |  |  |  |  |  |  | 33,648 | 32,521 |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,001 | 2,018 | 771 |  |  |
Income (Loss) from Continuing Operations, net of Tax | (120) | [1] | 298 | 66 | [1] | 233 | 155 | [2] | 192 | [2] | 224 | [2] | 778 | [2] | 477 | 1,349 | (148) |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | (120) |  | 298 | 67 |  | 233 | 181 |  | 191 |  | 416 |  | 777 |  | 478 | 1,565 | (777) |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION | (78) |  | $ 210 | $ 17 |  | $ 154 | 128 |  | $ 101 |  | $ 290 |  | $ 684 |  | 303 | 1,203 | (1,161) |  |  |
Accrued Liabilities, Current | 1,021 |  |  |  |  |  | 962 |  |  |  |  |  |  |  | 1,021 | 962 |  | 989 |  |
Other Liabilities, Noncurrent | 2,917 |  |  |  |  |  | 2,723 |  |  |  |  |  |  |  | 2,917 | 2,723 |  | 2,949 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 580 |  |  |  |  |  | 578 |  |  |  |  |  |  |  | 580 | 578 |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent | 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 |  |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets, Noncurrent |  |  |  |  |  |  | 253 |  |  |  |  |  |  |  |  | 253 |  |  |  |
Accrued Liabilities, Current |  |  |  |  |  |  | 27 |  |  |  |  |  |  |  |  | 27 |  |  |  |
Other Liabilities, Noncurrent |  |  |  |  |  |  | 226 |  |  |  |  |  |  |  |  | 226 |  |  |  |
Balance Without the Adoption of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,800 |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,207 |  |  |  |
Gross Profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,593 |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 252 |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |  |  |
Other Assets, Current |  |  |  |  |  |  | 741 |  |  |  |  |  |  |  |  | 741 |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent |  |  |  |  |  |  | 122 |  |  |  |  |  |  |  |  | 122 |  |  |  |
Service Concession Assets |  |  |  |  |  |  | 1,261 |  |  |  |  |  |  |  |  | 1,261 |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Noncurrent |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 |  |  |  |
Assets |  |  |  |  |  |  | 32,318 |  |  |  |  |  |  |  |  | 32,318 |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | (1,112) |  |  |  |  |  |  |  |  | (1,112) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  | (2,088) |  |  |  |  |  |  |  |  | (2,088) |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  | 2,317 |  |  |  |  |  |  |  |  | 2,317 |  |  |  |
Liabilities and Equity |  |  |  |  |  |  | 32,318 |  |  |  |  |  |  |  |  | 32,318 |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,978 |  |  |  |
Income (Loss) from Continuing Operations, net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,309 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,525 |  |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,163 |  |  |  |
ASC 606 Impact [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (64) |  |  |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44) |  |  |  |
Gross Profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20) |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58 |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Other Assets, Current |  |  |  |  |  |  | 66 |  |  |  |  |  |  |  |  | 66 |  |  | 61 |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent |  |  |  |  |  |  | (25) |  |  |  |  |  |  |  |  | (25) |  |  | (24) |
Service Concession Assets |  |  |  |  |  |  | (1,261) |  |  |  |  |  |  |  |  | (1,261) |  |  | (1,360) |
Financing Receivable, before Allowance for Credit Loss, Noncurrent |  |  |  |  |  |  | 1,423 |  |  |  |  |  |  |  |  | 1,423 |  |  | 1,490 |
Assets |  |  |  |  |  |  | 203 |  |  |  |  |  |  |  |  | 203 |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | 107 |  |  |  |  |  |  |  |  | 107 |  |  | 67 |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  | 17 |  |  | 19 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  | 79 |  |  |  |  |  |  |  |  | 79 |  |  | $ 81 |
Liabilities and Equity |  |  |  |  |  |  | 203 |  |  |  |  |  |  |  |  | 203 |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |
Income (Loss) from Continuing Operations, net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |
Retained Earnings [Member] | Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Retained Earnings [Member] | Accounting Standard Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6 |  |
Debt Securities [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 326 |  |  |  |  |  |  |  |  |  |  |  |  |  | 326 |  |  |  |  |
ARGENTINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | 64 |  |  |  |  |  | $ 93 |  |  |  |  |  |  |  | 64 | 93 |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 373 | $ 487 | $ 435 |  |  |
ARGENTINA | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 64 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64 |  |  |  |  |
[1] | Includes pre-tax impairment expense of $116 million and $69 million, in the second and fourth quarters of 2019, respectively (See Note 22—Asset Impairment Expense), other-than-temporary impairment of OPGC of $92 million and net equity in losses of affiliates, primarily at Guacolda, of $175 million, in the fourth quarter of 2019 (See Note 8—Investments in and Advances to Affiliates).
[2] | Includes pre-tax gains on sales of business interests of $788 million, $89 million and $128 million, in the first, second and fourth quarters of 2018, respectively, and pre-tax losses of $21 million in the third quarter of 2018 (See Note 25—Held-for-Sale and Dispositions), pre-tax impairment expense of $92 million, $74 million and $42 million, in the second, third and fourth quarters of 2018, respectively (See Note 22—Asset Impairment Expense), other-than-temporary impairment of Guacolda of $144 million in the fourth quarter of 2018 (See Note 8—Investments in and Advances to Affiliates), SAB 118 charges to finalize the provisional estimate of one-time transition tax on foreign earnings of $33 million and $161 million in the third and fourth quarters of 2018, respectively, and a SAB 118 income tax benefit to finalize the provisional estimate of remeasurement of deferred tax assets and liabilities to the lower corporate tax rate of $77 million in the fourth quarter of 2018 (See Note 23—Income Taxes).

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