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Schedule I - Condensed Financial Information of Parent (Statement of Comprehensive Income) (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]              
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION $ 504,000,000 $ 276,000,000 $ 708,000,000 $ 1,212,000,000 $ 1,679,000,000 $ 249,000,000 $ (546,000,000)
Foreign currency translation activity:              
Foreign currency translation adjustments, net of $0 income tax for all periods 40,000,000 (136,000,000) (179,000,000) (139,000,000) (236,000,000) 146,000,000 (36,000,000)
Reclassification to earnings, net of $0 income tax for all periods         649,000,000 0 0
Total foreign currency translation adjustments 40,000,000 (136,000,000) (179,000,000) (139,000,000) 413,000,000 146,000,000 (36,000,000)
Derivative activity:              
Change in fair value of derivatives, net of income tax expense of $93, $7 and $198, respectively (262,000,000) 92,000,000 292,000,000 30,000,000 463,000,000 (1,000,000) 711,000,000
Reclassification to earnings, net of income tax benefit (expense) of $(8), $9 and $0, respectively (3,000,000) 23,000,000 21,000,000 18,000,000 30,000,000 (73,000,000) 59,000,000
Pension activity:              
Change in pension adjustments due to prior service cost, net of $0 income tax for all periods         0 1,000,000 0
Change in pension adjustments due to net actuarial gain (loss) for the period, net of income tax (expense) benefit of $2, $1 and $(2), respectively 0 1,000,000 1,000,000 1,000,000 (5,000,000) (4,000,000) 13,000,000
Reclassification of earnings, net of income tax expense of $1, $0 and $1, respectively         15,000,000 0 (1,000,000)
Total pension adjustments 0 1,000,000 1,000,000 1,000,000 10,000,000 (3,000,000) 14,000,000
OTHER COMPREHENSIVE INCOME (225,000,000) (20,000,000) 138,000,000 (87,000,000) 919,000,000 69,000,000 748,000,000
COMPREHENSIVE INCOME (LOSS) (10,000,000) 133,000,000 569,000,000 559,000,000 1,721,000,000 (113,000,000) 243,000,000
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax   0 0 (9,000,000) 0    
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 (65,000,000) 22,000,000 66,000,000 1,000,000 98,000,000 (3,000,000) 191,000,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax 0   7,000,000 7,000,000 8,000,000 9,000,000 9,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax         0    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax     0 0 (2,000,000) 0 5,000,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax         1,000,000 0 1,000,000
Total change in fair value of derivatives $ (265,000,000) $ 115,000,000 $ 313,000,000 $ 48,000,000 493,000,000 (74,000,000) 770,000,000
Parent Company              
Condensed Financial Statements, Captions [Line Items]              
NET INCOME (LOSS) ATTRIBUTABLE TO THE AES CORPORATION         1,679,000,000 249,000,000 (546,000,000)
Foreign currency translation activity:              
Foreign currency translation adjustments, net of $0 income tax for all periods         (159,000,000) 136,000,000 (37,000,000)
Reclassification to earnings, net of $0 income tax for all periods         71,000,000 0 0
Total foreign currency translation adjustments         (88,000,000) 136,000,000 (37,000,000)
Derivative activity:              
Change in fair value of derivatives, net of income tax expense of $93, $7 and $198, respectively         315,000,000 55,000,000 645,000,000
Reclassification to earnings, net of income tax benefit (expense) of $(8), $9 and $0, respectively         18,000,000 (52,000,000) 44,000,000
Pension activity:              
Change in pension adjustments due to prior service cost, net of $0 income tax for all periods         0 1,000,000 0
Change in pension adjustments due to net actuarial gain (loss) for the period, net of income tax (expense) benefit of $2, $1 and $(2), respectively         (5,000,000) (4,000,000) 10,000,000
Reclassification of earnings, net of income tax expense of $1, $0 and $1, respectively         7,000,000 0 0
Total pension adjustments         2,000,000 (3,000,000) 10,000,000
OTHER COMPREHENSIVE INCOME         250,000,000 136,000,000 662,000,000
COMPREHENSIVE INCOME (LOSS)         1,929,000,000 385,000,000 116,000,000
OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax         0    
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         (93,000,000) (7,000,000) (198,000,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax         (8,000,000) 9,000,000 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax         0    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax         2,000,000 1,000,000 (2,000,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax         (1,000,000) 0 (1,000,000)
Total change in fair value of derivatives         $ 333,000,000 $ 3,000,000 $ 689,000,000