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Capital structure and financing - C.5. Cash and deposits (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [2] | Dec. 31, 2017 | [2]
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Cash and Cash Equivalents [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 875,000,000 | $ 1,164,000,000 | [1] | $ 528,000,000 | $ 619,000,000
Restricted cash | 199,000,000 | 155,000,000 | [1] |  |
Non-current financial assets pledged as collateral for contingent liabilities | 0 | 0 |  |  |
Current financial assets pledged as collateral for contingent liabilities | 0 | 1,000,000 |  |  |
Debt denominated in US dollars |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Cash and cash equivalents | 619,000,000 | 834,000,000 |  |  |
Total debt denominated in other currencies |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Cash and cash equivalents | 256,000,000 | 330,000,000 |  |  |
Mobile Financial Services |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash | 192,000,000 | 150,000,000 |  |  |
Other Banks |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash | $ 7,000,000 | $ 5,000,000 |  |  |
[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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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_i&doctype=Standard -URIDate 2019-03-27 + Details
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