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v3.20.1

Summary of significant accounting policies - Narrative (Details) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) contract | Dec. 31, 2017 USD ($) | Jan. 01, 2019
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Weighted-average interest rate of leases (as a percent) |  |  |  | 7.06%
Increase (decrease) retained earnings |  | $ 0 |  |
Number of power agreements | contract |  | 2 |  |
Expiration Date 2042 |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Power agreement terms |  | 15 years |  |
Expiration date 2024 |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Power agreement terms |  | 15 years |  |
Expiration date 2025 |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Power agreement terms |  | 15 years |  |
Trademarks | Bottom of range |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Useful lives of intangible assets |  | 10 years |  |
Trademarks | Top of range |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Useful lives of intangible assets |  | 20 years |  |
Software | Bottom of range |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Useful lives of intangible assets |  | 3 years |  |
Software | Top of range |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Useful lives of intangible assets |  | 5 years |  |
IAS 16 |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Increase (decrease) in property, plant and equipment | $ 545,000,000 |  |  |
Increase (decrease) in deferred tax liability (asset) | $ 139,000,000 |  |  |
IAS 8 |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Increase (decrease) in deferred tax liability (asset) |  |  | $ 12,000,000 |
Increase (decrease) retained earnings |  |  | 45,000,000 |
Increase (decrease) in investment property |  |  | $ 40,000,000 |

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- Definition The increase (decrease) in investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76&doctype=Standard -URIDate 2018-03-16 + Details
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