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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, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION | $ (632) | $ 343 | $ 28 | $ (148) | $ 318 | $ (333) | $ (83) | $ 144 | $ (409) | $ 46 | $ 303
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 $0, $(8) and $1, respectively |  |  |  |  |  |  |  |  | (130) | (52) | (33)
Reclassification to earnings, net of $0 income tax for all periods |  |  |  |  |  |  |  |  | 3 | 192 | 23
Total foreign currency translation adjustments |  |  |  |  |  |  |  |  | (127) | 140 | (10)
Derivative activity: |  |  |  |  |  |  |  |  |  |  |
Change in derivative fair value, net of income tax benefit of $8, $90 and $53, respectively |  |  |  |  |  |  |  |  | 5 | (368) | (265)
Reclassification to earnings, net of income tax expense of $73, $19 and $4, respectively |  |  |  |  |  |  |  |  | 387 | 74 | 42
Pension activity: |  |  |  |  |  |  |  |  |  |  |
Prior service cost for the period, net of income tax expense of $0, $1 and $0, respectively |  |  |  |  |  |  |  |  | 0 | (1) | (1)
Change in pension adjustments due to net actuarial gain (loss) for the period, net of income tax (expense) benefit of $(9), $4 and $6, respectively |  |  |  |  |  |  |  |  | 26 | (14) | (23)
Reclassification of earnings, net of income tax expense of $3, $0 and $13, respectively |  |  |  |  |  |  |  |  | (1) | 0 | (28)
Total pension adjustments |  |  |  |  |  |  |  |  | 27 | (13) | 6
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | 292 | (167) | (227)
COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (659) | (15) | 251
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax |  |  |  |  |  |  |  |  | 0 | (8) | 1
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 |  |  |  |  |  |  |  |  | (1) | (110) | (74)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  |  |  |  |  |  | 105 | 17 | 12
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | 10 | (4) | (10)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | 3 | 0 | 13
Total change in fair value of derivatives |  |  |  |  |  |  |  |  | 392 | (294) | (223)
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION |  |  |  |  |  |  |  |  | (409) | 46 | 303
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 $0, $(8) and $1, respectively |  |  |  |  |  |  |  |  | (86) | 0 | (23)
Reclassification to earnings, net of $0 income tax for all periods |  |  |  |  |  |  |  |  | 3 | 192 | 23
Total foreign currency translation adjustments |  |  |  |  |  |  |  |  | (83) | 192 | 0
Derivative activity: |  |  |  |  |  |  |  |  |  |  |
Change in derivative fair value, net of income tax benefit of $8, $90 and $53, respectively |  |  |  |  |  |  |  |  | (7) | (309) | (202)
Reclassification to earnings, net of income tax expense of $73, $19 and $4, respectively |  |  |  |  |  |  |  |  | 254 | 72 | 36
Pension activity: |  |  |  |  |  |  |  |  |  |  |
Prior service cost for the period, net of income tax expense of $0, $1 and $0, respectively |  |  |  |  |  |  |  |  | 0 | 0 | 1
Change in pension adjustments due to net actuarial gain (loss) for the period, net of income tax (expense) benefit of $(9), $4 and $6, respectively |  |  |  |  |  |  |  |  | 23 | (12) | (16)
Reclassification of earnings, net of income tax expense of $3, $0 and $13, respectively |  |  |  |  |  |  |  |  | 1 | 0 | 27
Total pension adjustments |  |  |  |  |  |  |  |  | 24 | (12) | 12
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | 188 | (57) | (154)
COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (221) | (11) | 149
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax |  |  |  |  |  |  |  |  | 0 | (8) | 1
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 |  |  |  |  |  |  |  |  | 8 | 90 | 53
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  |  |  |  |  |  | (73) | (19) | (4)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax |  |  |  |  |  |  |  |  | 0 | (1) | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | (9) | 4 | 6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  |  |  |  |  |  |  |  | (3) | 0 | (13)
Total change in fair value of derivatives |  |  |  |  |  |  |  |  | $ 247 | $ (237) | $ (166)

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