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Schedule I - Condensed Financial Information of Parent (Statement of Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION | $ 318 | $ (333) | $ (83) | $ 144 | $ (78) | $ 210 | $ 17 | $ 154 | $ 46 | $ 303 | $ 1,203
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments, net of income tax (expense) benefit of $(8), $1 and $2, respectively |  |  |  |  |  |  |  |  | (52) | (33) | (161)
Reclassification to earnings, net of $0 income tax for all periods |  |  |  |  |  |  |  |  | 192 | 23 | (21)
Total foreign currency translation adjustments |  |  |  |  |  |  |  |  | 140 | (10) | (182)
Derivative activity: |  |  |  |  |  |  |  |  |  |  |
Change in derivative fair value, net of income tax benefit of $90, $53 and $16, respectively |  |  |  |  |  |  |  |  | (368) | (265) | (67)
Reclassification to earnings, net of income tax expense of $19, $4 and $13, respectively |  |  |  |  |  |  |  |  | 74 | 42 | 93
Total change in fair value of derivatives |  |  |  |  |  |  |  |  | (294) | (223) | 26
Pension activity: |  |  |  |  |  |  |  |  |  |  |
Prior service cost for the period, net of income tax expense of $1, $0 and $1, respectively |  |  |  |  |  |  |  |  | (1) | (1) | 2
Change in pension adjustments due to net actuarial gain (loss) for the period, net of income tax benefit (expense) of $4, $6 and $(1), respectively |  |  |  |  |  |  |  |  | (14) | (23) | (1)
Reclassification of earnings, net of income tax expense of $0, $13 and $2, respectively |  |  |  |  |  |  |  |  | 0 | (28) | (8)
Total pension adjustments |  |  |  |  |  |  |  |  | (13) | 6 | 5
OTHER COMPREHENSIVE LOSS |  |  |  |  |  |  |  |  | (167) | (227) | (151)
COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (15) | 251 | 1,414
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax |  |  |  |  |  |  |  |  | (8) | 1 | 2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  |  |  |  |  |  |  |  | (110) | (74) | (27)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  |  |  |  |  |  | 17 | 12 | 24
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax |  |  |  |  |  |  |  |  | 0 | 0 | (1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | (4) | (10) | (1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | 0 | 13 | 2
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION |  |  |  |  |  |  |  |  | 46 | 303 | 1,203
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments, net of income tax (expense) benefit of $(8), $1 and $2, respectively |  |  |  |  |  |  |  |  | 0 | (23) | (214)
Reclassification to earnings, net of $0 income tax for all periods |  |  |  |  |  |  |  |  | 192 | 23 | (21)
Total foreign currency translation adjustments |  |  |  |  |  |  |  |  | 192 | 0 | (235)
Derivative activity: |  |  |  |  |  |  |  |  |  |  |
Change in derivative fair value, net of income tax benefit of $90, $53 and $16, respectively |  |  |  |  |  |  |  |  | (309) | (202) | (64)
Reclassification to earnings, net of income tax expense of $19, $4 and $13, respectively |  |  |  |  |  |  |  |  | 72 | 36 | 78
Total change in fair value of derivatives |  |  |  |  |  |  |  |  | (237) | (166) | 14
Pension activity: |  |  |  |  |  |  |  |  |  |  |
Prior service cost for the period, net of income tax expense of $1, $0 and $1, respectively |  |  |  |  |  |  |  |  | 0 | 1 | (2)
Change in pension adjustments due to net actuarial gain (loss) for the period, net of income tax benefit (expense) of $4, $6 and $(1), respectively |  |  |  |  |  |  |  |  | (12) | (16) | 2
Reclassification of earnings, net of income tax expense of $0, $13 and $2, respectively |  |  |  |  |  |  |  |  | 0 | 27 | 7
Total pension adjustments |  |  |  |  |  |  |  |  | (12) | 12 | 7
OTHER COMPREHENSIVE LOSS |  |  |  |  |  |  |  |  | (57) | (154) | (214)
COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (11) | 149 | 989
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax |  |  |  |  |  |  |  |  | (8) | 1 | 2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |  |  |  |  |  |  |  |  | 90 | 53 | 16
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  |  |  |  |  |  | (19) | (4) | (13)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax |  |  |  |  |  |  |  |  | (1) | 0 | (1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | 4 | 6 | (1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | $ 0 | $ (13) | $ (2)

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