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Long-term assets - E.2.2. Movements in tangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | $ 2,880 | $ 3,057
Change in scope (see note A.1.2.) | 354 | 3
Additions | 698 | 824
Impairments/reversal of impairment,net | 1 | (8)
Disposals, net | (29) | (114)
Depreciation charge | (685) | (725)
Asset retirement obligations | 15 | 20
Transfers | 6 | 19
Transfers from/(to) assets held for sale | (52) | (211)
Exchange rate movements | (147) | 15
Closing balance, net | 3,041 | 2,880
Cost or valuation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 7,038 |
Closing balance, net | 7,747 | 7,038
Accumulated amortization and impairment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | (4,158) |
Closing balance, net | (4,706) | (4,158)
Networks (including civil works) |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 2,399 | 2,525
Change in scope (see note A.1.2.) | 276 | 2
Additions | 63 | 201
Impairments/reversal of impairment,net | 1 | (6)
Disposals, net | (24) | (115)
Depreciation charge | (631) | (663)
Asset retirement obligations | 14 | 18
Transfers | 551 | 613
Transfers from/(to) assets held for sale | (45) | (184)
Exchange rate movements | (124) | 9
Closing balance, net | 2,480 | 2,399
Recognised finance lease as assets | 307 | 329
Networks (including civil works) | Cost or valuation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 6,164 |
Closing balance, net | 6,802 | 6,164
Networks (including civil works) | Accumulated amortization and impairment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | (3,764) |
Closing balance, net | (4,322) | (3,764)
Land and buildings |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 147 | 147
Change in scope (see note A.1.2.) | 46 | 1
Additions | 1 | 0
Impairments/reversal of impairment,net | 0 | 0
Disposals, net | (2) | 0
Depreciation charge | (11) | (9)
Asset retirement obligations | 1 | 2
Transfers | 9 | 7
Transfers from/(to) assets held for sale | (3) | (3)
Exchange rate movements | (8) | 2
Closing balance, net | 181 | 147
Land and buildings | Cost or valuation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 191 |
Closing balance, net | 252 | 191
Land and buildings | Accumulated amortization and impairment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | (44) |
Closing balance, net | (71) | (44)
Construction in progress |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 206 | 250
Change in scope (see note A.1.2.) | 32 | 0
Additions | 626 | 616
Impairments/reversal of impairment,net | 0 | 1
Disposals, net | (2) | 3
Depreciation charge | 0 | 0
Asset retirement obligations | 0 | 0
Transfers | (568) | (650)
Transfers from/(to) assets held for sale | (2) | (16)
Exchange rate movements | (8) | 3
Closing balance, net | 284 | 206
Construction in progress | Cost or valuation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 206 |
Closing balance, net | 284 | 206
Construction in progress | Accumulated amortization and impairment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 0 |
Closing balance, net | 0 | 0
Other |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 128 | 135
Change in scope (see note A.1.2.) | 0 | 0
Additions | 7 | 7
Impairments/reversal of impairment,net | 0 | (2)
Disposals, net | 0 | (1)
Depreciation charge | (43) | (53)
Asset retirement obligations | 0 | 0
Transfers | 14 | 48
Transfers from/(to) assets held for sale | (2) | (8)
Exchange rate movements | (7) | 1
Closing balance, net | 97 | 128
Other | Cost or valuation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | 477 |
Closing balance, net | 409 | 477
Other | Accumulated amortization and impairment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Opening balance, net | (349) |
Closing balance, net | $ (312) | $ (349)

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_75_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&doctype=Standard -URIDate 2018-03-16 + Details
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