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Capital structure and financing - C.3.1. Bond financing (Details) |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Oct. 16, 2018 USD ($) | Oct. 15, 2017 USD ($) | Sep. 20, 2017 USD ($) | Mar. 11, 2015 USD ($) | Dec. 07, 2012 USD ($) | Aug. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2016 USD ($) | May 31, 2012 USD ($) | May 31, 2012 BOB (Bs.) | May 31, 2011 USD ($) | Mar. 31, 2010 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | [1] | Oct. 12, 2017 USD ($) | Aug. 11, 2016 USD ($) | Aug. 11, 2016 BOB (Bs.) | May 31, 2016 COP ($) | Nov. 30, 2015 USD ($) | Nov. 30, 2015 BOB (Bs.) | Aug. 04, 2015 USD ($) | May 31, 2011 COP ($) | Mar. 31, 2010 COP ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,501,000,000 | $ 2,147,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt and other financing |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,155,000,000 | 996,000,000 | [1] | $ 713,000,000 |  |  |  |  |  |  |  |  |
SEK Senior Unsecured Variable Rate Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 243,000,000 |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  | $ 227,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption fees |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of unamortized costs |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SEK Senior Unsecured Variable Rate Notes | Stockholm Inter Bank Offered Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |
USD 6.625% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 495,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing costs capitalised | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6.625% Senior Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 6.625% |  |  |  |  |  |  |  |  |  |  |  |  | 6.625% |  |  |  |  |  |  |  |  |  |  |  |
USD 6.625% Senior Notes | Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 491,000,000 | 496,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing costs capitalised |  |  |  | $ 8,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6% Senior Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
USD 6% Senior Notes | Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 6.132% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6.625% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 473,000,000 | $ 186,000,000 |  |  |  |  | $ 142,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption fees |  |  |  |  |  |  | $ 22,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of unamortized costs |  |  |  |  |  |  | $ 6,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6.625% Senior Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.625% |  |  |  |  |  |  |  |  |  |  |  |
USD 5.125% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 493,000,000 | 494,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing costs capitalised |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings amortization period |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 5.125% Senior Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.125% |  |  |  |  |  |  |  |  |  |  | 5.125% |  |  |  |  |  |  |  |  |  |  |  |
USD 5.125% Senior Notes | Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 5.24% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6.75% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 297,000,000 | 296,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |
Issuance percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt and other financing |  |  |  |  | $ 293,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for debt issue costs |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD 6.75% Senior Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 6.75% |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |
USD 6.75% Senior Notes | Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 7.12% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BOB 4.75% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,000,000 | 86,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount | Bs. |  |  |  |  |  |  |  |  |  |  | Bs. 1,360,000,000.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt and other financing |  |  |  |  |  |  |  |  |  | $ 191,000,000 | 1,320,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for debt issue costs | Bs. |  |  |  |  |  |  |  |  |  |  | Bs. 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BOB 4.75% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 4.75% |  |  | 4.75% |  |  |  |  |  |  |  |  |  |  |  |
BOB 4.75% Notes | Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 4.79% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BOB Notes Issued November 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | Bs. 696,000,000 |  |  |
Borrowings premium | Bs. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Bs. 4,590,000 |  |  |
BOB Notes Issued November 2015 | Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.84% | 4.84% |  |  |
BOB 4.05% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 | Bs. 104,400,000 |  |  |
BOB 4.05% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.05% |  |  |  |  |  |  |  | 4.05% | 4.05% |  |  |
BOB 4.85% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,000,000 | 85,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 | Bs. 591,600,000 |  |  |
BOB 4.85% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.85% |  |  |  |  |  |  |  | 4.85% | 4.85% |  |  |
BOB 4.85% Notes | Weighted average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.55% | 4.55% |  |  |
BOB Notes Issued April 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount | Bs. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Bs. 522,000,000 |  |  |  |  |  |
BOB 3.95% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
BOB 3.95% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.95% |  |  |  |  | 3.95% | 3.95% |  |  |  |  |  |
BOB 4.30% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
BOB 4.30% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |  | 4.30% | 4.30% |  |  |  |  |  |
BOB Notes Issued October 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |
BOB Notes Issued October 2017 | Weighted average | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.66% |  |  |  |  |  |  |  |
BOB 4.30% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 | 30,000,000 |  |  |  |  |  |  |  |  |  |  |
BOB 4.30% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |  |  |  |  |
BOB 4.70% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 | 35,000,000 |  |  |  |  |  |  |  |  |  |  |
BOB 4.70% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |
BOB 5.30% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,000,000 | 13,000,000 |  |  |  |  |  |  |  |  |  |  |
BOB 5.30% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.30% |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 1 (tranches A and B) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 126,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000,000
UNE Bond 1 (tranches A and B) | Consumer Price Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.10% |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 1 - Tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 1 - Tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 2 (tranches A and B) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  | $ 126,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000,000 |
UNE Bond 2 (tranches A and B) | Consumer Price Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.76% |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 2 - Tranche A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 2 - Tranche B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings term |  |  |  |  |  |  |  |  |  |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  | $ 150,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  | 176,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 540,000,000,000 |  |  |  |  |
UNE Bond 3 (tranche A) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 | 54,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  | $ 52,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |
UNE Bond 3 (tranche A) | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.35% |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 3 (tranche B) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 78,000,000 | 85,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  | $ 83,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  | 4.15% |  |  |  |  |  |  |  |  |  |  |  | 4.15% |  |  |  |  |
UNE Bond 3 (tranche B) | Consumer Price Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.15% |  |  |  |  |  |  |  |  |  |  |  |
UNE Bond 3 (tranche C) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,000,000 | 43,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  | $ 41,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  | 4.89% |  |  |  |  |  |  |  |  |  |  |  | 4.89% |  |  |  |  |
UNE Bond 3 (tranche C) | Consumer Price Index |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.89% |  |  |  |  |  |  |  |  |  |  |  |
Cable Onda Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 184,000,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Borrowings face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 185,000,000 |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |
Cable Onda Bonds | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |
El Salvador 8% Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Re-presented for discontinued operations (shown in note A.4. and E.3.2.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.

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- Definition The amount of bonds issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2018-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2018-03-01&anchor=para_26_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The cash outflow for debt issue costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The cash inflow from borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Borrowings, Amortization Period + References No definition available. + Details
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- Definition Early Redemption Fees, Before Write-Off Of Unamortized Cost + References No definition available. + Details
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