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Financial risk management - D.5. Liquidity risk (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [2] | Dec. 31, 2017 | [2]
--- | --- | --- | --- | --- | --- | ---
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt and financing | $ (5,691) | $ (5,972) |  |  |
Lease liabilities | (1,021) | (1,096) |  |  |
Cash and cash equivalents | 875 | 1,164 | [1] | $ 528 | $ 619
Pledged deposits (related to back borrowings) | 0 | 1 |  |  |
Net cash (debt) including derivatives related to debt | (5,849) | (5,885) |  |  |
Trade payables (excluding accruals) | (46) | (40) |  |  |
Derivative financial liabilities | 12 | (17) |  |  |
Put option liability | (262) | (264) | [1] |  |
Trade receivables | 351 | 371 | [1] |  |
Liquidity risk |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt and financing | (5,691) | (5,972) |  |  |
Lease liabilities | (1,021) | (1,096) |  |  |
Cash and cash equivalents | 875 | 1,164 |  |  |
Pledged deposits (related to back borrowings) | 0 | 1 |  |  |
Refundable deposit | 0 | 0 |  |  |
Derivative financial instruments | 12 | (17) |  |  |
Net cash (debt) including derivatives related to debt | (5,825) | (5,920) |  |  |
Future interest commitments related to debt and financing |  | (1,502) |  |  |
Future interest commitments related to debt and financing | (1,484) |  |  |  |
Future interest commitments related to leases | (759) | (928) |  |  |
Trade payables (excluding accruals) | (576) | (510) |  |  |
Other financial liabilities (including accruals) | (1,214) | (1,389) |  |  |
Put option liability | (262) | (264) |  |  |
Trade receivables | 351 | 371 |  |  |
Other financial assets | 735 | 717 |  |  |
Net financial liabilities | (9,034) | (9,425) |  |  |
Liquidity risk | Less than 1 year |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt and financing | (113) | (186) |  |  |
Lease liabilities | (123) | (107) |  |  |
Cash and cash equivalents | 875 | 1,164 |  |  |
Pledged deposits (related to back borrowings) | 0 | 1 |  |  |
Refundable deposit | 0 | 0 |  |  |
Derivative financial instruments | 0 | (17) |  |  |
Net cash (debt) including derivatives related to debt | 639 | 855 |  |  |
Future interest commitments related to debt and financing |  | (308) |  |  |
Future interest commitments related to debt and financing | (311) |  |  |  |
Future interest commitments related to leases | (146) | (157) |  |  |
Trade payables (excluding accruals) | (576) | (510) |  |  |
Other financial liabilities (including accruals) | (1,185) | (1,052) |  |  |
Put option liability | (262) | (264) |  |  |
Trade receivables | 351 | 371 |  |  |
Other financial assets | 568 | 613 |  |  |
Net financial liabilities | (922) | (452) |  |  |
Liquidity risk | 1 to 5 years |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt and financing | (1,824) | (1,902) |  |  |
Lease liabilities | (525) | (490) |  |  |
Cash and cash equivalents | 0 | 0 |  |  |
Pledged deposits (related to back borrowings) | 0 | 0 |  |  |
Refundable deposit | 0 | 0 |  |  |
Derivative financial instruments | 12 | 0 |  |  |
Net cash (debt) including derivatives related to debt | (2,336) | (2,392) |  |  |
Future interest commitments related to debt and financing |  | (1,088) |  |  |
Future interest commitments related to debt and financing | (1,069) |  |  |  |
Future interest commitments related to leases | (410) | (476) |  |  |
Trade payables (excluding accruals) | 0 | 0 |  |  |
Other financial liabilities (including accruals) | (29) | (337) |  |  |
Put option liability | 0 | 0 |  |  |
Trade receivables | 0 | 0 |  |  |
Other financial assets | 167 | 104 |  |  |
Net financial liabilities | (3,676) | (4,189) |  |  |
Liquidity risk | Greater than 5 years |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Debt and financing | (3,755) | (3,884) |  |  |
Lease liabilities | (373) | (498) |  |  |
Cash and cash equivalents | 0 | 0 |  |  |
Pledged deposits (related to back borrowings) | 0 | 0 |  |  |
Refundable deposit | 0 | 0 |  |  |
Derivative financial instruments | 0 | 0 |  |  |
Net cash (debt) including derivatives related to debt | (4,128) | (4,383) |  |  |
Future interest commitments related to debt and financing |  | (106) |  |  |
Future interest commitments related to debt and financing | (104) |  |  |  |
Future interest commitments related to leases | (203) | (295) |  |  |
Trade payables (excluding accruals) | 0 | 0 |  |  |
Other financial liabilities (including accruals) | 0 | 0 |  |  |
Put option liability | 0 | 0 |  |  |
Trade receivables | 0 | 0 |  |  |
Other financial assets | 0 | 0 |  |  |
Net financial liabilities | $ (4,435) | $ (4,784) |  |  |
Commercial Banks | Liquidity risk |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Concentration risk percentage | 20.00% | 26.00% |  |  |
Bonds | Liquidity risk |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Concentration risk percentage | 64.00% | 58.00% |  |  |
Development Finance Institutions | Liquidity risk |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Concentration risk percentage | 1.00% | 1.00% |  |  |
Leases | Liquidity risk |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Concentration risk percentage | 15.00% | 15.00% |  |  |
[1] | The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).
[2] | 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.

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