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Schedule I - Condensed Financial Information of Parent (Balance Sheet) (Details) - USD ($) | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | --- | ---
Current Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ 1,089,000,000 |  | $ 1,029,000,000 |  |  |  |
Restricted cash | 297,000,000 |  | 336,000,000 |  |  |  |
Assets, Current | 5,414,000,000 |  | 5,231,000,000 |  |  |  |
Investment in and advances to subsidiaries and affiliates | 835,000,000 |  | 966,000,000 |  |  | $ 1,114,000,000 |
Office Equipment: |  |  |  |  |  |  |
Cost | 26,707,000,000 |  | 25,383,000,000 |  |  |  |
Accumulated depreciation | (8,472,000,000) |  | (8,505,000,000) |  |  |  |
Property, plant and equipment, net | 22,826,000,000 |  | 22,574,000,000 |  |  |  |
Other Assets: |  |  |  |  |  |  |
Deferred income taxes | 288,000,000 |  | 156,000,000 |  |  |  |
Other assets | 1,660,000,000 | $ 1,605,000,000 | 1,635,000,000 |  | $ 1,767,000,000 |  |
Total other assets | 6,363,000,000 |  | 5,843,000,000 |  |  |  |
Assets | 34,603,000,000 |  | 33,648,000,000 |  |  | 32,521,000,000 |
Current Liabilities: |  |  |  |  |  |  |
Accounts payable | 1,156,000,000 |  | 1,311,000,000 |  |  |  |
Accrued and other liabilities | 1,223,000,000 |  | 987,000,000 |  | 989,000,000 |  |
Total current liabilities | 5,362,000,000 |  | 5,096,000,000 |  |  |  |
Long-term Liabilities: |  |  |  |  |  |  |
Other long-term liabilities | 3,241,000,000 |  | 2,917,000,000 |  | $ 2,949,000,000 |  |
Liabilities, Noncurrent | 23,649,000,000 |  | 22,435,000,000 |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |
Common stock | 8,000,000 |  | 8,000,000 | $ 14.16 |  |  |
Additional paid-in capital | 7,561,000,000 |  | 7,776,000,000 |  |  |  |
Accumulated deficit | (680,000,000) | $ (731,000,000) | (692,000,000) |  |  |  |
Accumulated other comprehensive loss | (2,397,000,000) |  | (2,229,000,000) |  |  | (2,071,000,000) |
Treasury stock | (1,858,000,000) |  | (1,867,000,000) |  |  |  |
Total AES Corporation stockholders’ equity | 2,634,000,000 |  | 2,996,000,000 |  |  |  |
TOTAL LIABILITIES AND EQUITY | 34,603,000,000 |  | 33,648,000,000 |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |
Current Assets: |  |  |  |  |  |  |
Cash and cash equivalents | 70,000,000 |  | 11,000,000 |  |  | $ 19,000,000 | $ 10,000,000
Accounts and notes receivable from subsidiaries | 188,000,000 |  | 238,000,000 |  |  |  |
Prepaid expenses and other current assets | 55,000,000 |  | 35,000,000 |  |  |  |
Assets, Current | 313,000,000 |  | 284,000,000 |  |  |  |
Investment in and advances to subsidiaries and affiliates | 6,426,000,000 |  | 6,782,000,000 |  |  |  |
Office Equipment: |  |  |  |  |  |  |
Cost | 29,000,000 |  | 27,000,000 |  |  |  |
Accumulated depreciation | (22,000,000) |  | (20,000,000) |  |  |  |
Property, plant and equipment, net | 7,000,000 |  | 7,000,000 |  |  |  |
Other Intangible Assets, Net | 0 |  | 1,000,000 |  |  |  |
Other Assets: |  |  |  |  |  |  |
Debt Issuance Costs, Noncurrent, Net | 4,000,000 |  | 5,000,000 |  |  |  |
Deferred income taxes | 25,000,000 |  | 14,000,000 |  |  |  |
Other assets | 20,000,000 |  | 16,000,000 |  |  |  |
Total other assets | 49,000,000 |  | 36,000,000 |  |  |  |
Assets | 6,795,000,000 |  | 7,109,000,000 |  |  |  |
Current Liabilities: |  |  |  |  |  |  |
Accounts payable | 15,000,000 |  | 20,000,000 |  |  |  |
Accounts and notes payable to subsidiaries | 184,000,000 |  | 339,000,000 |  |  |  |
Accrued and other liabilities | 344,000,000 |  | 221,000,000 |  |  |  |
Senior notes payable—current portion | 0 |  | 5,000,000 |  |  |  |
Total current liabilities | 543,000,000 |  | 585,000,000 |  |  |  |
Long-term Liabilities: |  |  |  |  |  |  |
Senior notes payable | 3,430,000,000 |  | 3,391,000,000 |  |  |  |
Accounts and notes payable to subsidiaries | 28,000,000 |  | 28,000,000 |  |  |  |
Other long-term liabilities | 160,000,000 |  | 109,000,000 |  |  |  |
Liabilities, Noncurrent | 3,618,000,000 |  | 3,528,000,000 |  |  |  |
Stockholders' equity: |  |  |  |  |  |  |
Common stock | 8,000,000 |  | 8,000,000 |  |  |  |
Additional paid-in capital | 7,561,000,000 |  | 7,776,000,000 |  |  |  |
Accumulated deficit | (680,000,000) |  | (692,000,000) |  |  |  |
Accumulated other comprehensive loss | (2,397,000,000) |  | (2,229,000,000) |  |  |  |
Treasury stock | (1,858,000,000) |  | (1,867,000,000) |  |  |  |
Total AES Corporation stockholders’ equity | 2,634,000,000 |  | 2,996,000,000 |  |  |  |
TOTAL LIABILITIES AND EQUITY | 6,795,000,000 |  | 7,109,000,000 |  |  |  |
Accumulated Amortization, Debt Issuance Costs, Noncurrent | $ 6,000,000 |  | $ 5,000,000 |  |  |  |

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