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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)