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Subsequent events (Details) $ in Millions, $ in Millions | Feb. 16, 2021 USD ($) | Feb. 11, 2021 USD ($) | Feb. 16, 2021 COP ($)
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2026, 2068 And 2029 Notes | Exercise Right To Call Outstanding Principal |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Percent of borrowing outstanding called |  | 10.00% |
Redemption percent premium |  | 103.00% |
Repayments of non-current borrowings |  | $ 180 |
February 2021 UNE Bond With 3 Maturities | Colombia Bond Issuance |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings face amount | $ 138 |  | $ 485,680
Une Serie 7 Years 5.56% Fixed Bond | Colombia Bond Issuance |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings term | 7 years |  |
Borrowings, interest rate | 5.56% |  | 5.56%
Une Serie 10 Years At CPI Plus 2.61% Margin Bond | Colombia Bond Issuance |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings term | 10 years |  |
Adjustment to interest rate basis | 2.61% |  | 2.61%
Une 15 Years At CPI Plus 3.18% Margin Bond | Colombia Bond Issuance |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Borrowings term | 15 years |  |
Adjustment to interest rate basis | 3.18% |  | 3.18%

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