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BORROWINGS - Borrowings by Currency (Details) ₨ in Millions, £ in Millions, S/ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 COP ($) | 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 ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 COP ($) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 CLF ( ) | Dec. 31, 2016 PEN (S/) | Dec. 31, 2016 AUD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 INR (₨) | Dec. 31, 2016 NZD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | $ 10,164 |  |  |  |  |  |  |  |  | $ 8,326 |  |  |  |  |  |  |  |
Interest on non-recourse borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 8,063 |  |  |  |  |  |  |  |  | 7,324 |  |  |  |  |  |  |  |
Interest on non-recourse borrowings | AUD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 1,013 |  |  |  |  | $ 1,297 |  |  |  | 922 |  |  |  |  | $ 1,281 |  |  |
Interest on non-recourse borrowings | GBP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 1,735 |  | £ 1,283 |  |  |  |  |  |  | 1,390 |  | £ 1,125 |  |  |  |  |  |
Interest on non-recourse borrowings | USD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 3,087 |  |  |  |  |  |  |  |  | 3,039 |  |  |  |  |  |  |  |
Interest on non-recourse borrowings | UF |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 960 |  |  | 22 |  |  |  |  |  | 901 |  |  | 23 |  |  |  |  |
Interest on non-recourse borrowings | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 397 |  |  |  |  |  | $ 499 |  |  | 263 |  |  |  |  |  | $ 354 |  |
Interest on non-recourse borrowings | COP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 184 | $ 549,384 |  |  |  |  |  |  |  | 133 | $ 403,030 |  |  |  |  |  |  |
Interest on non-recourse borrowings | PEN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 458 |  |  |  | S/ 1,483 |  |  |  |  | 439 |  |  |  | S/ 1,473 |  |  |  |
Interest on non-recourse borrowings | INR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | 186 |  |  |  |  |  |  | ₨ 11,847 |  | 196 |  |  |  |  |  |  | ₨ 13,324 |
Interest on non-recourse borrowings | NZD |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary and corporate borrowings | $ 43 |  |  |  |  |  |  |  | $ 61 | $ 41 |  |  |  |  |  |  |  | $ 59

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