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Capital structure and financing - C.3.4. Finance leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) tower	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disclosure of finance lease and operating lease by lessee [line items]
Cash received from sales and leaseback transaction	$ 141	$ 167	$ 0
Finance lease liabilities	353	365
Income from tower deal transactions	65	63	$ 0
Tanzania (excluding Zantel)
Disclosure of finance lease and operating lease by lessee [line items]
Finance lease liabilities	$ 112	121
Colombia
Disclosure of finance lease and operating lease by lessee [line items]
Number of units in agreement | tower	1,207
Cumulative number of units transferred | tower	902
Agreement price	$ 147
Cash received from sales and leaseback transaction	26	86
Income from tower deal transactions	$ 13	37
Paraguay
Disclosure of finance lease and operating lease by lessee [line items]
Number of units in agreement | tower	1,410
Cumulative number of units transferred | tower	1,276
Agreement price	$ 125
Cash received from sales and leaseback transaction	41	75
Finance lease liabilities	27	21
Income from tower deal transactions	$ 19	26
El Salvador
Disclosure of finance lease and operating lease by lessee [line items]
Number of units in agreement | tower	811
Cumulative number of units transferred | tower	496
Agreement price	$ 145
Cash received from sales and leaseback transaction	73	0
Finance lease liabilities	26	20
Income from tower deal transactions	33	0
Other Geographical Areas
Disclosure of finance lease and operating lease by lessee [line items]
Finance lease liabilities	6	17
Movil | Colombia
Disclosure of finance lease and operating lease by lessee [line items]
Finance lease liabilities	83	87
UNE EPM Telecommunicaciones SA | Colombia
Disclosure of finance lease and operating lease by lessee [line items]
Finance lease liabilities	$ 99	$ 100

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The amount of liabilities related to finance leases.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-02&anchor=para_55&doctype=Standard&book=b
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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
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