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Performance B.3. Segmental Information - Revenue from contracts with customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | $ 4,171 | $ 4,336 | $ 3,946 | [1]
Revenue | 4,171 | 4,336 | 3,946 | [1]
Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 2,116 | 2,150 | 2,126 |
Revenue | 2,116 | 2,150 | 2,126 |
Cable and other fixed services |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 1,803 | 1,928 | 1,565 |
Revenue | 1,803 | 1,928 | 1,565 |
Other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 52 | 51 | 43 |
Revenue | 52 | 51 | 43 |
Service revenue |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 3,971 | 4,130 | 3,734 |
Revenue | 3,971 | 4,130 | 3,734 |
Telephone and equipment and other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 201 | 206 | 212 |
Revenue | 201 | 206 | 212 |
Latin America |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 3,805 | 3,954 | 3,548 |
Revenue | 3,805 | 3,954 | 3,548 |
Latin America | Service revenue |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 3,604 | 3,748 | 3,336 |
Revenue | 3,604 | 3,748 | 3,336 |
Africa |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 366 | 382 | 399 |
Revenue | 366 | 382 | 399 |
Africa | Service revenue |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 366 | 382 | 398 |
Revenue | 366 | 382 | 398 |
Over time | Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 1,967 | 2,007 | 1,981 |
Revenue | 1,967 | 2,007 | 1,981 |
Over time | Cable and other fixed services |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 1,803 | 1,928 | 1,565 |
Revenue | 1,803 | 1,928 | 1,565 |
Over time | Other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 52 | 52 | 43 |
Revenue | 52 | 52 | 43 |
Over time | Latin America | Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 1,728 | 1,747 | 1,701 |
Revenue | 1,728 | 1,747 | 1,701 |
Over time | Latin America | Cable and other fixed services |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 1,794 | 1,919 | 1,556 |
Revenue | 1,794 | 1,919 | 1,556 |
Over time | Latin America | Other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 51 | 51 | 42 |
Revenue | 51 | 51 | 42 |
Over time | Africa | Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 239 | 261 | 280 |
Revenue | 239 | 261 | 280 |
Over time | Africa | Cable and other fixed services |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 8 | 9 | 10 |
Revenue | 8 | 9 | 10 |
Over time | Africa | Other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 1 | 1 | 1 |
Revenue | 1 | 1 | 1 |
Point in time | Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 149 | 143 | 145 |
Revenue | 149 | 143 | 145 |
Point in time | Telephone and equipment and other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 201 | 206 | 212 |
Revenue | 201 | 206 | 212 |
Point in time | Latin America | Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 31 | 31 | 37 |
Revenue | 31 | 31 | 37 |
Point in time | Latin America | Telephone and equipment and other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 201 | 206 | 212 |
Revenue | 201 | 206 | 212 |
Point in time | Africa | Mobile |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 118 | 112 | 108 |
Revenue | 118 | 112 | 108 |
Point in time | Africa | Telephone and equipment and other |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue | 0 | 0 | 0 |
Revenue | $ 0 | $ 0 | $ 0 |
[1] | 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 revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_113_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_114&doctype=Standard -URIDate 2019-03-27 + Details
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