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Debt (Recourse Debt Carrying Amount and Terms) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Recourse Debt Total   $ 3,447 $ 3,396
Recourse Debt Current   (1) (5)
Recourse Debt Non Current   $ 3,446 3,391
Senior Secured Term Loan due 2022 [Member] | Recourse Debt | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.75%  
Revolving Credit Facility [Member] | Recourse Debt | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75% 1.75%  
CDI + 7.00% Limited Recourse Debt | Recourse Debt | AES Holdings Brasil      
Debt Instrument [Line Items]      
Interest Rate   7.00%  
Recourse Debt Total   $ 18 0
Unamortized Discounts [Member]      
Debt Instrument [Line Items]      
Recourse Debt Total   (41)  
Parent Company [Member]      
Debt Instrument [Line Items]      
Recourse Debt Total   3,430  
Recourse Debt Current   $ 0  
Parent Company [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   4.00%  
Recourse Debt Total   $ 0 500
Parent Company [Member] | Senior Secured Term Loan due 2022 [Member] | Recourse Debt      
Debt Instrument [Line Items]      
Recourse Debt Total   $ 0 18
Parent Company [Member] | 4.875% Senior Notes Due 2023 [Member] [Member] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   4.875%  
Recourse Debt Total   $ 0 613
Parent Company [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   4.50%  
Recourse Debt Total   $ 0 500
Parent Company [Member] | Revolving Credit Facility [Member] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   1.86%  
Recourse Debt Total   $ 70 180
Parent Company [Member] | 5.50% Senior Unsecured Note Due 2024 | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   5.50%  
Recourse Debt Total   $ 0 63
Parent Company [Member] | 5.50% Unsecured senior notes due 2025 [Domain] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   5.50%  
Recourse Debt Total   $ 0 544
Parent Company [Member] | 3.30% Senior Notes Due 2025 | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   3.30%  
Recourse Debt Total   $ 900 0
Parent Company [Member] | 6.00% senior notes due 2026 [Domain] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   6.00%  
Recourse Debt Total   $ 0 500
Parent Company [Member] | 1.375% Senior Notes Due 2026 | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   1.375%  
Recourse Debt Total   $ 800 0
Parent Company [Member] | 5.125% Senior Notes Due 2027 [Member] | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   5.125%  
Recourse Debt Total   $ 0 500
Parent Company [Member] | 3.95% Senior Notes Due 2030 | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   3.95%  
Recourse Debt Total   $ 700 0
Parent Company [Member] | 2.45% Senior Notes Due 2031 | Recourse Debt      
Debt Instrument [Line Items]      
Interest Rate   2.45%  
Recourse Debt Total   $ 1,000 0
Parent Company [Member] | Unamortized Discounts [Member]      
Debt Instrument [Line Items]      
Recourse Debt Total   $ (40) $ (22)