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Equity (Transactions with Noncontrolling Interests) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2020 | Mar. 20, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | $ (95,000,000) | $ 28,000,000 | $ 984,000,000 |  |
Stockholders' Equity Attributable to Parent | $ 2,634,000,000 |  | 2,634,000,000 | 2,996,000,000 |  |  |
Additional Paid in Capital | 7,561,000,000 |  | 7,561,000,000 | 7,776,000,000 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (2,397,000,000) |  | $ (2,397,000,000) | (2,229,000,000) | (2,071,000,000) |  |
AES Tiete [Domain] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 44.10% |  | 44.10% |  |  |  |
Distributed Energy [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Sales to noncontrolling interests |  |  | $ 144,000,000 | 133,000,000 | 98,000,000 |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  |  | 51.00%
AES Southland [Domain] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  |  | 65.00% |  |  |  |
Additional Paid in Capital | $ 266,000,000 |  | $ 266,000,000 |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  | 424,000,000 |  |  |  |
Stockholders' Equity, Period Increase (Decrease) |  |  | $ 275,000,000 |  |  |  |
Sale of Stock, Description of Transaction |  |  | 35 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  | $ 9,000,000 |  |  |  |
AES Tiete [Domain] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries | 16,000,000 | $ 240,000,000 |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent | $ 0.013 | $ 0.185 |  |  |  |  |
AES Tiete |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  | 94,000,000 |  |  |  |
Stockholders' Equity, Period Increase (Decrease) |  |  | 214,000,000 |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  |  | 120,000,000 |  |  |  |
AES Gener |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction |  | 38.00% |  |  |  |  |
Preferred Units, Cumulative Cash Distributions |  |  |  |  |  | $ 12,000,000 |
Preferred Stock, Participation Rights |  | 12 million |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 113,000,000 |  |  |  |  |
Sale of Stock, Description of Transaction |  | 5 |  |  |  |  |
Investments |  | $ 113,000,000 |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Sales to noncontrolling interests |  |  | 260,000,000 | (5,000,000) | (3,000,000) |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  | $ (89,000,000) | $ 0 | $ 0 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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