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BORROWINGS - Borrowings by Currency (Details) - Interest on non-recourse borrowings ₨ in Millions, £ in Millions, S/ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions | Dec. 31, 2018 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 COP ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 CLF ( ) | Dec. 31, 2018 PEN (S/) | Dec. 31, 2018 AUD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 INR (₨) | Dec. 31, 2018 NZD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2017 COP ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 CLF ( ) | Dec. 31, 2017 PEN (S/) | Dec. 31, 2017 AUD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 INR (₨) | Dec. 31, 2017 NZD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | $ 13,113 |  |  |  |  |  |  |  |  |  | $ 8,063 |  |  |  |  |  |  |  |  |
AUD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 925 |  |  |  |  |  |  |  |  |  | 1,013 |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  |  |  |  | $ 1,312 |  |  |  |  |  |  |  |  |  | $ 1,297 |  |  |
GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 1,847 |  |  |  |  |  |  |  |  |  | 1,735 |  |  |  |  |  |  |  |  |
Borrowings, local currency | £ |  |  |  | £ 1,447 |  |  |  |  |  |  |  |  |  | £ 1,283 |  |  |  |  |  |
USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 5,317 |  |  |  |  |  |  |  |  |  | 3,087 |  |  |  |  |  |  |  |  |
Borrowings, local currency | 5,317 |  |  |  |  |  |  |  |  |  | 3,087 |  |  |  |  |  |  |  |  |
UF |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 837 |  |  |  |  |  |  |  |  |  | 960 |  |  |  |  |  |  |  |  |
Borrowings, local currency | |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  | 22 |  |  |  |  |
CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 1,388 |  |  |  |  |  |  |  |  |  | 397 |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  |  |  |  |  | $ 1,893 |  |  |  |  |  |  |  |  |  | $ 499 |  |
BRL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 1,342 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Borrowings, local currency | R$ |  | R$ 5,200 |  |  |  |  |  |  |  |  |  | R$ 0 |  |  |  |  |  |  |  |
COP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 411 |  |  |  |  |  |  |  |  |  | 184 |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  | $ 1,337,497 |  |  |  |  |  |  |  |  |  | $ 549,384 |  |  |  |  |  |  |
PEN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 441 |  |  |  |  |  |  |  |  |  | 458 |  |  |  |  |  |  |  |  |
Borrowings, local currency | S/ |  |  |  |  |  | S/ 1,486 |  |  |  |  |  |  |  |  |  | S/ 1,483 |  |  |  |
INR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | 565 |  |  |  |  |  |  |  |  |  | 186 |  |  |  |  |  |  |  |  |
Borrowings, local currency | ₨ |  |  |  |  |  |  |  |  | ₨ 39,236 |  |  |  |  |  |  |  |  |  | ₨ 11,847 |
NZD & Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse borrowings | $ 40 |  |  |  |  |  |  |  |  |  | $ 43 |  |  |  |  |  |  |  |  |
Borrowings, local currency |  |  |  |  |  |  |  |  |  | $ 60 |  |  |  |  |  |  |  |  |  | $ 61

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