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Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Net Income Attributable to Parent And Transfers To From Noncontrolling Interests [Text Block] | The following table summarizes the net income attributable to The AES Corporation and all transfers (to) from noncontrolling interests for the periods indicated (in millions):
|  | December 31,
|  | 2020 |  | 2019 |  | 2018
Net income attributable to The AES Corporation |  | $ | 46 |  |  | $ | 303 |  |  | $ | 1,203 |
Transfers from noncontrolling interest: |  |  |  |  |  |
Increase (decrease) in The AES Corporation's paid-in capital for sale of subsidiary shares |  | 260 |  |  | (5) |  |  | (3) |
Increase (decrease) in The AES Corporation's paid-in-capital for purchase of subsidiary shares |  | (89) |  |  | — |  |  | — |
Net transfers (to) from noncontrolling interest |  | 171 |  |  | (5) |  |  | (3) |
Change from net income attributable to The AES Corporation and transfers (to) from noncontrolling interests |  | $ | 217 |  |  | $ | 298 |  |  | $ | 1,200 |
Components of Accumulated Other Comprehensive Income | The changes in AOCL by component, net of tax and noncontrolling interests, for the periods indicated were as follows (in millions):
| Foreign currency translation adjustment, net |  | Derivative gains (losses), net |  | Unfunded pension obligations, net |  | Total
Balance at December 31, 2018 | $ | (1,721) |  |  | $ | (300) |  |  | $ | (50) |  |  | $ | (2,071) |
Other comprehensive loss before reclassifications | (23) |  |  | (202) |  |  | (15) |  |  | (240) |
Amount reclassified to earnings | 23 |  |  | 36 |  |  | 27 |  |  | 86 |
Other comprehensive income (loss) | — |  |  | (166) |  |  | 12 |  |  | (154) |
Cumulative effect of a change in accounting principle | — |  |  | (4) |  |  | — |  |  | (4) |
Balance at December 31, 2019 | $ | (1,721) |  |  | $ | (470) |  |  | $ | (38) |  |  | $ | (2,229) |
Other comprehensive loss before reclassifications | — |  |  | (309) |  |  | (12) |  |  | (321) |
Amount reclassified to earnings | 192 |  |  | 72 |  |  | — |  |  | 264 |
Other comprehensive income (loss) | 192 |  |  | (237) |  |  | (12) |  |  | (57) |
Reclassification from NCI due to share sales and repurchases | (115) |  |  | 8 |  |  | (4) |  |  | (111) |
Balance at December 31, 2020 | $ | (1,644) |  |  | $ | (699) |  |  | $ | (54) |  |  | $ | (2,397) |
Reclassification out of Accumulated Other Comprehensive Income | Reclassifications out of AOCL are presented in the following table. Amounts for the periods indicated are in millions and those in parenthesis indicate debits to the Consolidated Statements of Operations:
Details About |  |  |  | December 31,
AOCL Components |  | Affected Line Item in the Consolidated Statements of Operations |  | 2020 |  | 2019 |  | 2018
Foreign currency translation adjustments, net |  |  |  |
|  | Gain (loss) on disposal and sale of business interests |  | $ | (192) |  |  | $ | (23) |  |  | $ | 19 |
|  | Net gain from disposal of discontinued operations |  | — |  |  | — |  |  | 2 |
|  | Net income (loss) attributable to The AES Corporation |  | $ | (192) |  |  | $ | (23) |  |  | $ | 21 |
Derivative gains (losses), net |  |  |  |
|  | Non-regulated revenue |  | $ | (1) |  |  | $ | (1) |  |  | $ | (6) |
|  | Non-regulated cost of sales |  | (3) |  |  | (12) |  |  | (3) |
|  | Interest expense |  | (60) |  |  | (26) |  |  | (49) |
|  | Gain (loss) on disposal and sale of business interests |  | — |  |  | 1 |  |  | — |
|  | Asset impairment expense |  | (10) |  |  | — |  |  | — |
|  | Foreign currency transaction gains (losses) |  | (7) |  |  | (12) |  |  | (59) |
|  | Income (loss) from continuing operations before taxes and equity in earnings of affiliates |  | (81) |  |  | (50) |  |  | (117) |
|  | Income tax benefit (expense) |  | 17 |  |  | 13 |  |  | 24 |
|  | Net equity in earnings (losses) of affiliates |  | (10) |  |  | (5) |  |  | — |
|  | Income (loss) from continuing operations |  | (74) |  |  | (42) |  |  | (93) |
|  | Less: Net loss (income) attributable to noncontrolling interests and redeemable stock of subsidiaries |  | 2 |  |  | 6 |  |  | 15 |
|  | Net income (loss) attributable to The AES Corporation |  | $ | (72) |  |  | $ | (36) |  |  | $ | (78) |
Amortization of defined benefit pension actuarial losses, net |  |  |  |
|  | Regulated cost of sales |  | $ | (1) |  |  | $ | — |  |  | $ | — |
|  | Non-regulated cost of sales |  | 1 |  |  | — |  |  | — |
|  | Other expense |  | — |  |  | (2) |  |  | (6) |
|  | Gain (loss) on disposal and sale of business interests |  | — |  |  | (26) |  |  | — |
|  | Income (loss) from continuing operations before taxes and equity in earnings of affiliates |  | — |  |  | (28) |  |  | (6) |
|  | Income tax benefit (expense) |  | — |  |  | — |  |  | 2 |
|  | Income (loss) from continuing operations |  | — |  |  | (28) |  |  | (4) |
|  | Net gain (loss) from disposal of discontinued operations |  | — |  |  | — |  |  | (2) |
|  | Net income (loss) |  | — |  |  | (28) |  |  | (6) |
|  | Less: Income from continuing operations attributable to noncontrolling interests and redeemable stock of subsidiaries |  | — |  |  | 1 |  |  | (1) |
|  | Net income (loss) attributable to The AES Corporation |  | $ | — |  |  | $ | (27) |  |  | $ | (7) |
Total reclassifications for the period, net of income tax and noncontrolling interests |  | $ | (264) |  |  | $ | (86) |  |  | $ | (64) |

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