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BORROWINGS - Borrowings by Currency (Details) - Interest on non-recourse borrowings € in Millions, ₨ in Millions, £ in Millions, S/ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 INR (₨) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 CLF ( ) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 COP ($) | Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 AUD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 NZD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 INR (₨) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 CLF ( ) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 COP ($) | Dec. 31, 2019 PEN (S/) | Dec. 31, 2019 AUD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 NZD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | $ 20,020 |  |  |  |  |  |  |  |  |  |  | $ 18,544 |  |  |  |  |  |  |  |  |  |
USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 7,457 |  |  |  |  |  |  |  |  |  |  | 7,801 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | 7,457 |  |  |  |  |  |  |  |  |  |  | 7,801 |  |  |  |  |  |  |  |  |  |
CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 2,400 |  |  |  |  |  |  |  |  |  |  | 2,473 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  | $ 3,056 |  |  |  |  |  |  |  |  |  |  | $ 3,212 |  |  |  |  |  |  |
GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 2,941 |  |  |  |  |  |  |  |  |  |  | 2,411 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | £ |  |  | £ 2,151 |  |  |  |  |  |  |  |  |  |  | £ 1,819 |  |  |  |  |  |  |  |
BRL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 1,161 |  |  |  |  |  |  |  |  |  |  | 1,489 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | R$ |  |  |  |  |  | R$ 6,035 |  |  |  |  |  |  |  |  |  |  | R$ 6,002 |  |  |  |  |
INR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 3,760 |  |  |  |  |  |  |  |  |  |  | 1,427 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | ₨ |  | ₨ 274,457 |  |  |  |  |  |  |  |  |  |  | ₨ 101,929 |  |  |  |  |  |  |  |  |
UF |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 1,201 |  |  |  |  |  |  |  |  |  |  | 1,099 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | |  |  |  |  | 29 |  |  |  |  |  |  |  |  |  |  | 29 |  |  |  |  |  |
AUD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 320 |  |  |  |  |  |  |  |  |  |  | 1,010 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  |  |  |  |  |  | $ 416 |  |  |  |  |  |  |  |  |  |  | $ 1,439 |  |
PEN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 417 |  |  |  |  |  |  |  |  |  |  | 452 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | S/ |  |  |  |  |  |  |  | S/ 1,511 |  |  |  |  |  |  |  |  |  |  | S/ 1,497 |  |  |
COP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 418 |  |  |  |  |  |  |  |  |  |  | 342 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  |  |  |  | $ 1,430,115 |  |  |  |  |  |  |  |  |  |  | $ 1,124,325 |  |  |  |
European Union euros |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 59 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency | € |  |  |  |  |  |  |  |  |  | € 48 |  |  |  |  |  |  |  |  |  |  | € 0 |
NZD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | $ 43 |  |  |  |  |  |  |  |  |  |  | $ 40 |  |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  |  |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  |  | $ 59

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