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Performance B.2. Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cost of sales: |  |  |  |  |
Direct costs of services sold | $ (829) | $ (913) |  | $ (857) |
Cost of telephone, equipment and other accessories | (230) | (219) |  | (254) |
Bad debt and obsolescence costs | (87) | (72) |  | (63) |
Cost of sales | (1,146) | (1,205) | [1] | (1,175) | [1]
Operating expenses, net |  |  |  |  |
Marketing expenses | (404) | (463) |  | (442) |
Site and network maintenance costs | (209) | (176) |  | (160) |
Employee related costs (B.4.) | (514) | (451) |  | (451) |
External and other services | (185) | (152) |  | (218) |
Rentals and operating leases | (155) | (155) |  | (159) |
Other operating expenses | (207) | (197) |  | (196) |
Operating expenses, net | (1,674) | (1,593) | [1] | (1,627) | [1]
Other operating income (expenses), net: |  |  |  |  |
Income from tower deal transactions | 65 | 63 |  | 0 |
Impairment of intangible assets and property, plant and equipment | (6) | (12) |  | (6) |
Gain (loss) on disposals of intangible assets and property, plant and equipment | 8 | 1 |  | (8) |
Other income (expenses) | 9 | 16 |  | 0 |
Other operating income (expenses), net | $ 76 | $ 68 | [1] | $ (14) | [1]
[1] | Re-presented for discontinued operations (shown in note A.4.). 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 costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_104&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gains (losses) arising from sale and leaseback transactions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_i&doctype=Standard -URIDate 2018-03-16 + Details
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